JP2013174489A - Strontium catching and collection method, strontium catching and collection device, and strontium analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a reagent amount and to reduce secondary waste by enabling Sr catching and collection, and an analysis ofSr in a short period of time without requiring complicated preprocessing.SOLUTION: A strontium catching and collection method comprises a first step for storing an Sr selective adsorption agent formed so as to adsorb selectively transmitted Sr with Ca in a non-transmission state in column, causing a water solution containing sea water and a sea water salt component to flow in the column while being brought into contact with the Sr selective adsorption agent when the water solution is injected into the column, eliminating adsorption of Ca with a Ca alginic acid film coexisting to be non-transmission, selectively transmitting Sr to arrive at an Sr adsorption member, and adsorbing the selectively transmitted Sr, and a second step for leaving the non-transmitted Ca behind in the water solution containing the sea water and the sea water salt component, eliminating the Ca from the column, and collecting the adsorbed Sr by extracting the Sr by using an Sr extraction liquid.

Description

The present invention relates to a method for selectively collecting and recovering strontium (Sr) or / and strontium containing ⁸⁹ Sr and ⁹⁰ Sr which are radioisotopes contained in wastewater such as seawater, concentrated seawater or diluted seawater. The present invention relates to an apparatus, a method and an apparatus for analyzing radioactive strontium performed by using these, a decontamination method, and a method for purifying seawater.

  A practical technique for selectively removing strontium ions from an aqueous solution such as seawater containing strontium ions and containing a plurality of types of metal ions is desired. In particular, when calcium ions or magnesium ions coexist in the aqueous solution, practical application is difficult.

  Conventionally, when these metal ions coexist in an aqueous solution, the metal ions are removed by precipitation, adsorbed and removed using an ion exchanger, electrodialyzed using an ion exchange membrane, Or the method of isolate | separating water by distillation or a reverse osmosis membrane has been employ | adopted.

  Patent Document 1 describes contacting with a perovskite type compound containing titanium or niobium in order to separate strontium from an aqueous solution containing strontium ions and containing a plurality of metal ions.

  Patent Document 2 describes adsorbing strontium ions in an aqueous solution using titanium hydrate.

  Patent Document 3 describes that radioactive strontium is removed from a waste liquid by using a solid material in which any one of calcium carbonate, strontium carbonate, and barium carbonate is occluded.

  Non-Patent Document 1 describes that Cs is adsorbed by comprehensively fixing AMP microcrystals of about several microns in a polymer carrier of calcium alginate.

Non-Patent Document 2 describes a method for analyzing radioactive strontium. A Radioactive strontium analysis, shown in Figure 16 ^{[90 Sr]} seawater oxalate method, shown in Figure 17 ^{[90 Sr]} Seawater - describes a fuming nitric acid method and shown in Figure 18 ^{[90 Sr]} seawater ion exchange Yes.

JP 2005-230664 A Japanese Patent Publication No.62-1293 Japanese Patent Laid-Open No. 2002-267996

10th Anniversary Symposium Lecture “Synthesis and radionuclide separation of highly selective composite adsorbents” Ministry of Education, Culture, Sports, Science and Technology Revised 2003 Radioactivity Measurement Method Series 2 “Radioactive Strontium Analysis”

  A large amount of NaCl, Ca, and Mg coexist in the aqueous solution containing seawater and seawater salt components in a high concentration. In particular, Ca that is present in a large amount in seawater as compared with Sr acts as an inhibitory element that inhibits Sr adsorption, and it is extremely difficult to separate and recover Sr contained in an aqueous solution by separating it from Ca. . Separation of coexisting Ca and Sr in an aqueous solution containing seawater or seawater salt components means that both elements belong to the Group 2A alkaline earth metal in the periodic table and belong to the period 4.5. It is difficult because they are close to each other.

In the strontium separation / recovery means / method described in any of the above-mentioned patent documents, Sr ( ⁸⁹ Sr, which is radioactive Sr, ⁹⁰ Sr, which is contained in an aqueous solution in which seawater or seawater salt components are concentrated is included. ) Is separated by Sr alone under the influence of coexisting Ca.

  In order to facilitate the separation of Sr, it may be possible to remove Ca and Mg in advance by precipitation or other methods. However, a large amount of the removed Ca and Mg is accumulated, and the disposal is troublesome. It becomes.

  Non-Patent Document 1 describes the use of calcium alginate on the surface, but does not describe any properties for Sr separation, and the encapsulating material adsorbs Cs.

  The radioactive strontium analysis method described in Non-Patent Document 2 requires a large number of days for pretreatment and a complicated operation as shown in FIGS. ing.

In view of this point, the present invention is an aqueous solution containing seawater or a sea salt component, and can selectively adsorb Sr alone without being affected by Ca coexisting in the aqueous solution during the adsorption of Sr. By using an Sr adsorbent that allows Ca to remain in the aqueous solution without being substantially separated from the aqueous solution, the collection and recovery of Sr and the analysis of ⁹⁰ Sr are complicated. The purpose is to reduce the amount of secondary waste by reducing the amount of reagent so that it can be performed in a short time without requiring pretreatment.

  In the present invention, when used in an aqueous solution containing seawater or a seawater salt component, a Ca alginate film formed on the surface of a material that adsorbs Sr is made impervious to Ca, An Sr selective adsorbent that enables selective adsorption of Sr by having the property of selectively transmitting coexisting Sr is used.

Specifically, the present invention is an inorganic material having a property that when a Ca alginate film is used in an aqueous solution containing seawater or a seawater salt component, the coexisting Ca is impermeable and Sr is selectively permeated. By forming the surface layer of the Sr adsorbing member solidified in step S1, the Sr adsorbing member accommodates the Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state of impervious to Ca. When an aqueous solution containing seawater or a seawater salt component is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent, thereby eliminating the adsorption of Ca coexisting with the Ca alginate film. The first step of selectively permeating Sr to reach the Sr adsorbing member and adsorbing the selectively permeated Sr,
The impervious Ca consists of a second step in which it remains in an aqueous solution containing seawater and seawater salt components, is discharged from the column, and the adsorbed Sr is extracted using an Sr extract. A method for collecting and collecting Sr is provided.

In the present invention, when the Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Ca and Mg coexist with Ca and Mg, and selectively permeate Sr. By forming the surface layer of the solidified Sr adsorbing member, the Sr adsorbing member is stored in the column so that the Sr adsorbing member adsorbs selectively permeated Sr in a state where Ca and Mg are impermeable. Then, when an aqueous solution containing seawater or a seawater salt component is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent, and Ca and Mg coexisting with the Ca alginate film. A first step of eliminating adsorption and making it impervious, selectively allowing Sr to permeate to reach the Sr adsorbing member, and adsorbing selectively permeated Sr;
The impervious Ca and Mg remain in an aqueous solution containing seawater and seawater salt components, and are discharged from the column, and the second step is to recover the adsorbed Sr by extracting it with the Sr extract. A method for collecting and collecting Sr, characterized by the following:

In the present invention, when the aqueous solution containing the radioactive Sr analysis sample containing no seawater or seawater salt component is injected into the column in the first step, the Sr selective adsorbent is introduced into the column. The Ca alginate film is allowed to pass through while being in contact with the Sr, and the Sr adsorption member is selectively permeated to reach the Sr adsorbing member, so that the selectively permeated Sr is adsorbed.
The second step is also used as a step of recovering by leaving the column in an aqueous solution containing an impermeable radioactive Sr analysis sample, discharging from the column, and extracting the adsorbed Sr using an Sr extract. A method for collecting and collecting Sr, characterized by the following:

In the present invention, when the aqueous solution containing the radioactive Sr analysis sample containing no seawater or seawater salt component is injected into the column in the first step, the Sr selective adsorbent is introduced into the column. The Ca alginate film allows Sr to selectively permeate and reach the Sr adsorbing member to adsorb the selectively permeated Sr.
The second step is characterized in that it remains in an aqueous solution containing an impermeable radioactive Sr analysis sample, is discharged from the column, and the adsorbed Sr is extracted and extracted by using an Sr extract. Provided is a method for collecting and collecting Sr.

  The present invention also provides a third step of separating and recovering Sr, characterized in that, in any of the above, the Sr extract is passed through an ion exchange resin and purified by Sr to separate and recover Sr. The present invention provides a method for separating and recovering Sr, characterized by comprising:

The present invention is also purified from an aqueous solution containing seawater or sea salt component or an aqueous solution containing a radioactive Sr analysis sample when ⁸⁹ Sr and ⁹⁰ Sr are contained in the above-described aqueous solution containing sea water or sea salt component. The fourth step of analyzing ⁹⁰ Sr radioactivity by eluting the ⁹⁰ Sr daughter nuclide ⁹⁰ Y with the Sr retained in the ion exchange resin and measuring ⁹⁰ Y A method for analyzing ⁹⁰ Sr from recovered Sr is provided.

The present invention is also configured such that the third step described above includes decontamination of ⁸⁹ Sr and ⁹⁰ Sr when ⁸⁹ Sr and ⁹⁰ Sr are contained in an aqueous solution containing seawater and seawater salt components. ⁸⁹ Sr and ⁹⁰ Sr decontamination methods are provided.

The present invention also evaluates the recovery rate of ⁸⁹ Sr and ⁹⁰ Sr from the recovered Sr, and continues decontamination of ⁸⁹ Sr and ⁹⁰ Sr within a range where the recovery rate is equal to or greater than a predetermined value. ⁸⁹ Sr and ⁹⁰ Sr The present invention provides a method for purifying an aqueous solution containing seawater or seawater salt components, comprising a fifth step of purifying as an aqueous solution containing seawater or seawater salt components decontaminated.

In the present invention, when the Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Ca alginate film has a property of making the coexisting Ca impervious and selectively permeating Sr, and solidifying with an inorganic material. By forming the surface layer of the Sr adsorbing member formed, the Sr adsorbing member accommodates the Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state in which Ca is impermeable to the column. When seawater or an aqueous solution containing a seawater salt component is injected into the column, it is allowed to flow through the column while being in contact with the Sr selective adsorbent, thereby eliminating the adsorption of Ca coexisting with the Ca alginate film. Sr adsorbing means that permeates, selectively transmits Sr to reach the Sr adsorbing member, and adsorbs selectively transmitted Sr;
Impervious Ca is made up of recovery means for remaining in an aqueous solution containing seawater and seawater salt components, discharging from the column, and recovering the adsorbed Sr by extracting with Sr extract. An apparatus for collecting and collecting Sr is provided.

In the present invention, when the Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Ca and Mg coexist with Ca and Mg, and selectively permeate Sr. A column containing a Sr selective adsorbent formed so that the Sr adsorbing member adsorbs selectively permeated Sr in a state in which Ca and Mg are impermeable by forming a surface layer of the solidified Sr adsorbing member When an aqueous solution containing seawater or a seawater salt component is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent, and Ca and Mg coexisting with a Ca alginate film. Sr adsorption means for eliminating adsorption and making it impermeable, allowing Sr to selectively permeate to reach the Sr adsorption member, and adsorb the selectively transmitted Sr;
Impervious Ca and Mg remain in an aqueous solution containing seawater and seawater salt components, are discharged from the column, and are composed of recovery means for recovering the adsorbed Sr by extracting it with an Sr extract. A characteristic Sr collection and recovery device is provided.

In the present invention, when the aqueous solution containing the radioactive Sr analysis material not containing seawater or seawater salt component is injected into the column, the Sr selective adsorbent is introduced into the column. The Ca alginate film is allowed to pass through while being in contact with the Sr, and the Sr adsorption member is selectively permeated to reach the Sr adsorbing member, so that the selectively permeated Sr is adsorbed.
It is also used as a step in which the collecting means is left in an aqueous solution containing a non-permeable radioactive Sr analysis sample, discharged from the column, and recovered by extracting the adsorbed Sr using a Sr extract. An Sr collection and recovery device is provided.

In the present invention, when the aqueous solution containing the radioactive Sr analysis sample containing no seawater or seawater salt component is injected into the column, the Sr selective adsorbent is introduced into the column. The Ca alginate film allows Sr to selectively permeate and reach the Sr adsorbing member to adsorb the selectively permeated Sr.
In the second step, the Sr is recovered by being left in an aqueous solution containing an impermeable radioactive Sr analysis sample, discharged from the column, and extracting the adsorbed Sr using an Sr extract. Provide collection and recovery equipment.

According to the present invention, in any of the above, the Sr extract is passed through an ion exchange resin and purified by Sr to separate and recover Sr. When ⁸⁹ Sr and ⁹⁰ Sr are contained in the aqueous solution containing the salt component, the Sr purified from the seawater or the aqueous solution containing the sea salt component or from the aqueous solution containing the radioactive Sr analysis sample is retained in the ion exchange resin. eluted ⁹⁰ Sr daughters ⁹⁰ Y of ^{the 90} Sr analyzer from recovered Sr characterized by comprising a analyzer for analyzing the radioactivity ⁹⁰ Sr by measuring the ⁹⁰ Y provide.

According to the present invention, by forming a surface layer of the Sr selective adsorption member with a film made of Ca alginic acid, Ca coexisting when used in an aqueous solution containing seawater or a seawater salt component is impervious to Sr. Is selectively permeated and separated from an aqueous solution in which Ca exists, and selectively adsorbs selectively permeated Sr without being affected by coexisting Ca, and Ca itself is substantially adsorbed and separated. By using a Sr adsorbent that can remain in an aqueous solution without any problems, Sr collection and ⁹⁰ Sr analysis can be performed in a short time without requiring complicated pretreatment. The amount of secondary waste can be reduced by reducing the amount.

The figure which shows the manufacturing method for comprising the Example of this invention. The figure which shows the structure of a dripping nozzle. The figure which shows the concept of Sr selective adsorption agent. The figure explaining the performance of Sr selective adsorption agent. The figure which shows the result of having investigated the coexistence influence of the chelating agent for RO membrane scale prevention. The figure which shows the result of having investigated the influence of seawater salt component density | concentration change. The figure explaining the Sr collection method which collects Sr using the Sr selective adsorption agent in the aqueous solution containing the seawater and seawater salt component by the Example of this invention. The figure which shows the method and conditions which test the performance of Sr removal using seawater. The figure which shows the Sr removal performance from seawater. ^The figure which shows the ⁸⁵ Sr addition seawater decontamination hot test method and conditions. The figure which shows seawater addition ⁸⁵ Sr decontamination test result. The figure which shows the ⁸⁵ Sr analysis result of a column passage liquid. The figure which shows ⁸⁵ Sr adsorption distribution in a column. ^The figure which shows the leaching state of adsorption | suction Sr when seawater washing | cleans the Sr selective adsorption agent which adsorb | sucked ⁸⁵ Sr. The figure which shows one method of collecting and collect | recovering the conventional radioactive strontium. The figure which shows one method of collecting and collect | recovering the conventional radioactive strontium. The figure which shows one method of collecting and collect | recovering the conventional radioactive strontium. The figure which shows one method of collecting and collect | recovering the conventional radioactive strontium.

  First, the Sr adsorbent used in the present invention will be described. As described above, a Ca alginate film is formed on the surface of a granular Sr adsorbing member that adsorbs selectively permeated Sr solidified with an inorganic material, and is used in an aqueous solution containing seawater or seawater salt components. An Sr selective adsorbent that allows selective adsorption of Sr by using a property of making Ca non-permeable and selectively allowing Sr coexisting with Ca to be used is used.

  Here, as the Sr adsorbing member, various materials that are capable of adsorbing Sr and can be solidified can be used. As the Sr adsorbing member, for example, a known zeolite-based or aluminum rimate-based inorganic material, or an inorganic material composed of alumina and silica can be used.

  Further, as a Sr adsorbing member, as a material having Sr adsorbing ability, titania-based, syria-based, alumina-based, or a composite titania-alumina-based or silica-alumina-based material, or aluminum, yttrium, bismuth, chromium, iron. Indium, gallium, lead, beryllium, copper, cobalt, cadmium, zinc, nickel phosphate, or a material in which these materials are encapsulated in Ca-alginate may be used.

Patent Document 1 also describes a solid adsorbent suitable for removing ⁹⁰ Sr from waste liquid, and these materials can also be used.

  Among them, A-type zeolite or X-type zeolite, particularly sodium-A-type zeolite having a pore diameter of 4 angstroms or less is recommended as a material having Sr adsorption ability, particularly as a Syria-alumina system.

  These inorganic materials are solid and granulated and are prepared as Sr adsorption members. The size of the granulated state is not specified. Corresponding to the purpose of use, for example, the size can be arbitrarily selected according to the column input or precipitation purpose.

Alginic acid is well known as a polysaccharide abundant in seaweed, and is widely used in the fields of food, pharmaceuticals, fibers, papermaking, agriculture, industry, etc., and its solution is instantaneous with Ca ²⁺ , Sr ²⁺ , Ba ^{2+ and the} like. Gelation reaction and insolubilization.

  In the Sr adsorbent used in the present invention, a Ca alginate film is formed on the surface of a granular Sr adsorbing member. The present inventor has shown that the formed Ca alginate film has properties that it is used in an aqueous solution containing seawater or a seawater salt component to make Ca impervious and selectively permeate Sr coexisting with Ca. It was newly discovered by etc. It is permissible for other substances to be mixed in Ca alginic acid as long as the Ca alginic acid performance is not lowered.

  Here, “Ca is impermeable” means that the film does not adsorb Ca and does not permeate along with not adsorbing Ca. However, it should be understood as meaning a situation in which the film does not substantially adsorb Ca and does not permeate at the initial stage of operation of removing Sr. It should not be construed as absolutely opaque. And selective permeation of Sr means that Sr is selectively permeated from Ca and Sr both belonging to the 2A group alkaline earth metal in the periodic table.

  “Adsorption” is used in the upper meaning of separation / collection or decontamination derived from adsorption.

  “Forming a“ surface layer ”” means forming a surface film alone or in a mixed state. Alternatively, it also means forming a capsule state.

  FIG. 1 is a diagram showing a production method for producing an Sr adsorbent used in an example of the present invention.

  In FIG. 1, the Sr adsorbent manufacturing apparatus 100 includes a dropping nozzle apparatus 1 and a gelling apparatus 2.

  The dripping nozzle device 1 includes a raw material feeding pipe 3, multiple (in FIG. 1, six) dropping nozzles 4 connected to the pipe, and an air blowing pipe 5 connected to the dropping nozzle 4.

  The raw material solution is sent from the raw material feed pipe 3 to the dropping nozzle 4, and the air blown from the air blowing pipe 5 is sent to the dropping nozzle 4 so as to be intermittently blown.

  The raw material solution is a solution in which an Sr adsorbing member and alginic acid (Algi) are mixed. In the case of this embodiment, A-type zeolite (ZLA4) is preferably used as the Sr adsorbing member.

  FIG. 2 shows details of the dropping nozzle 4.

  In FIG. 2, the dripping nozzle 4 has a double nozzle configuration, and the raw material solution (ZLA4 + Algi) flows through the inner flow path 12 in the inner pipe 1, and is formed by the outer pipe 13 and the inner pipe 11. Air that is intermittently controlled flows through the outer flow path 14. The outer flow path 14 is narrowed at the outlet end, and an air flow with increased flow is blown inward.

  When the raw material solution that has flowed through the inner flow path 2 is discharged from the outlet end 15, it is cut into small particles by the air flow of intermittent air that has flowed through the outer flow path 14. The cut grains of the raw material solution are spheroidized by the surface tension. In the figure, the spheroidized particles are shown enlarged as droplets 6.

  In this example, a double nozzle configuration is used, but as a triple nozzle configuration, ZLA4 may be input from the inner basin and Algi may be input from the outer basin. If it does in this way, ZLA4 and Algi will be added separately, without mixing, and it will be in a separate composition state.

Returning to FIG. 1, the gelling apparatus 2 includes a container 21 and a gelling solution 22 stored in the air 21. In this example, the gelling solution 22 is CaCl ₂ . The upper surface of the solution 21 is opposed to the multiple dripping nozzles 4. That is, the droplet 6 falls in the vertical direction.

With such an arrangement, the dropped droplet 6 is received in the gelling solution, and the alginic acid on the surface of the droplet 6 is gelled with CaCl ₂ to form a Ca alginate film. As a result, a gel sphere whose surface is gelled is formed.

  FIG. 1 shows the generated gel sphere 7. The generated gel sphere 7 is recovered from the container 21. FIG. 1 shows the gel sphere collection 8.

  The recovered gel spheroids are in the form of particles, dried by a drier (not shown), and solidified with an inorganic material, and provided with a Ca alginate film that selectively permeates Sr, thereby selectively selecting Sr. It becomes a granular Sr selective adsorbent adsorbed on the surface.

  FIG. 3 shows the concept of this Sr selective adsorbent 30.

  In FIG. 3, the Sr selective adsorbent 30 is formed of an Sr adsorbing member 31 as an inner filling material and a Ca alginate film 32 formed on the surface. In this example, the Ca alginate film is integrally formed on the surface of the Sr adsorbing member in a mixed state with the Sr adsorbing member. By adopting a dropping nozzle having a triple nozzle configuration, the Ca alginate film 32 can be integrally formed on the surface of the Sr adsorption member 31. Between these, it is possible to form a third region through which selectively permeated Sr can be passed without participating in selective adsorption. Further, it is possible to mix a substance desired to participate in selective adsorption into the Ca alginate film 32.

  FIG. 3 shows a case where the Sr selective adsorbent 30 having such a form is taken out from the container 29 and placed in seawater salt component mixed water 33 as an environment, for example, RO concentrated water.

  As shown in FIG. 3, the thickness of the Ca alginate film 32 is considerably smaller than the particle size (for example, 1 to 2 mmΦ). That is, a thin film layer is formed.

The seawater salt component-mixed water ^{33, Sr 2+, 90 Sr 2+} , strontium containing radioactive strontium as radionuclides 89 ^{Sr 2+,} Ba ^2+, there is barium containing radioactive barium as radionuclides 140 ^{Ba 2+} .

On the other hand, Ca ²⁺ , Mg ²⁺ , Na ⁺ , Cl ⁻ , SO ₄ ²⁻ and HCO ₃ ⁻ are present. As is clear from these, Sr, Ca, and Mg coexist in the seawater salt component mixed water 33.

Example of seawater salt mixed water that was tried:
1) Kd value of Sr selective adsorbent (Example)
Add 2.5g of Sr selective adsorbent to 500ml of test solution and stir for 2h Seawater: Kd (Sr) 292
Fresh water: Kd (Sr)> 9.3e + 4
2) Kd value when consisting of only Sr selective adsorbent of Sr selective adsorbent 1 g of Sr selective adsorbent is added to 100,500 ml of test solution and stirred for 14 h Seawater: Kd (Sr) 645-857, Kd (Ca) 94- 135, Kd (Mg) 4.8-7.6
Fresh water: Kd (Sr) 6.9e + 3 to 1.0e + 4

  An Sr adsorption zone is formed in the Sr adsorption member 31 inside the Sr selective adsorbent 30. This zone is also an adsorption zone for Sr or Sr and Ba. The Ca alginate film 32 formed outside the Sr selective adsorbent 30 has a Ca impermeability function. This film also has an impervious function of Ca or Ca and Mg. In FIG. 3, functions are displayed as an Sr adsorption zone, a Ba adsorption zone, and a Ca impermeable film. The reason why the Mg impermeable film is not used is that Mg may be adsorbed in the initial stage of the adsorption operation. After this initial stage, the film becomes an Mg impervious film in the initial state of the adsorption operation. Therefore, in this state, both Ca and Mg are impervious.

  The Ca alginate film 32 selectively transmits Sr when Sr and Ca coexist. Although a large amount of Ca coexists in seawater or seawater salt mixed water, the Ca alginate film 32 selectively permeates Sr in the presence of Ca as an inhibitory element. The Ca alginate film 32 is used in an aqueous solution containing seawater or a seawater salt component, and has a property of making Ca impermeable and selectively allowing Sr to permeate. This was obtained by the inventors. This is a new finding.

  The Ca alginate film 32 selectively transmits Ba in addition to Sr. FIG. 3 shows this phenomenon as Sr, Ba selective transmission.

  As described above, the Ca alginate film 32 excludes the penetration of Ca to reach the internal Sr adsorption member 31. Further, the Ca alginate film 32 is excluded from reaching the internal Sr adsorbing member 31 in addition to Ca and further Ca. In this state, the selectively transmitted Sr reaches the Sr adsorption member and is adsorbed here. In the figure, this phenomenon is indicated as Ca and Mg exclusion. Ca or Sr from which Ca and Mg are excluded reaches the adsorption zone of the Sr adsorption member. The elimination of Ca and Mg means that Ca and Mg are not adsorbed and remain in seawater or seawater salt-mixed water and do not become secondary deposits. It has great significance in the process.

Na ⁺ , Cl ⁻ , SO ₄ ² −, HCO ₃ ⁻ present in seawater or seawater salt component mixed water does not participate in the adsorption of Sr or Ba.

  Here, as described above and as will be described later, the phenomenon that Ca is impermeable does not mean that Ca is not transmitted at all. In a practical process, at the start of trial, Ca is a Ca alginate film. It is said to be impervious, including the case where it does not substantially permeate and no longer penetrates. According to the inventors' experiment, the Ca alginate film does not adsorb Ca.

  Thus, Sr selectively permeated through the Ca alginate film 32 is adsorbed in the Sr adsorption zone formed by the Sr adsorption member 31. Therefore, Sr selective adsorbent or Sr is selectively adsorbed. Further, Ba that has selectively passed through the Ca alginate film 32 is adsorbed by the Ba adsorption capability of the Sr adsorption member 31.

  The Sr selective adsorbent 30 of this example is immersed in tetramethoxysilane, tetraethoxysilane, titanium tetraisopropoxide or titanium tetrabutoxide, and reacted with the hydroxyl group of alginic acid present on the surface of the Ca alginate film to produce silica or titania. The strength of the Sr adsorbent can be increased by forming a three-dimensional structure on the surface of the Ca alginate film by cross-linking with. As a result, a three-dimensional structure is formed on the surface of the Ca alginate film 32 in which silica or titania is cross-linked to the hydroxyl group of alginic acid.

  FIG. 4 shows the relationship between the amount of seawater flow obtained by filling the column with the Sr selective adsorbent of this example and the element adsorption removal rate when seawater is used. The Sr adsorbing member used in this example is A-type zeolite. Similar results are obtained using X-type zeolite. Further, even if the adsorbing member is other Sr, the same result can be obtained by the action of the Ca alginate film. Various types of Sr adsorbing members can be used, and many have been announced. It is also well known that the Sr adsorption member adsorbs Ba.

  A comparative example shows the case where the Sr adsorbent which consists only of the Sr adsorption member of the Sr selective adsorbent of this example and does not form a Ca alginate film is used.

  From FIG. 4, it can be seen that there are two major membrane effects resulting from the formation of the Ca alginate membrane.

  Membrane effect (1): According to this example, the removal rate of Sr shows a high value even when seawater flow increases. Moreover, according to the present Example, the removal rate of Ba shows a high value even if seawater flow increases. On the other hand, in the comparative example, the Sr removal rate decreases with Ca adsorption.

  Film effect (2): According to this example, no Ca adsorption to the Sr selective adsorbent was observed. Mg adsorption was slight at the beginning of operation. Even in this example, Mg adsorption was slightly observed, which was the same as the comparative example. This slight Mg adsorption does not affect Sr selective adsorption or Ba selective adsorption, or even if given. Further, when this operation initial stage is passed and the operation state is reached, Mg is also not adsorbed and becomes impermeable.

  As can be seen from FIG. 4, the Ca alginate film formed on the surface of the Sr adsorbing member is used in an aqueous solution containing seawater or a seawater salt component to make Ca impervious and selectively permeate the coexisting Sr. It has the characteristic of having. And the Sr selective adsorption agent of a present Example is equipped with the Ca alginate film | membrane which has such a characteristic, It is characterized by the above-mentioned. This characteristic state has important implications due to Sr selective adsorption.

  FIG. 5 shows the results of investigating the influence of this embodiment on the presence of a chelating agent for preventing RO membrane scale in seawater.

  From FIG. 5, it is determined that the coexistence of HEDP and EDTA has no influence on the Sr removal rate of this embodiment.

  FIG. 6 shows the results of examining the effect of seawater salt component concentration change (seawater ratio 1 to 5 times the concentration) on this example.

  FIG. 6 shows that the Sr removal rate tends to decrease slightly at a high salt concentration, but a high Sr removal rate can be maintained.

  FIG. 7 shows a method for collecting and recovering Sr using an Sr selective adsorbent in an aqueous solution containing seawater and seawater salt components according to an embodiment of the present invention.

  In FIG. 7, the in-frame process indicated by 60 is a pretreatment process using the Sr selective adsorbent 30 in the present embodiment.

  In the above description, when the Ca alginate film is used in an aqueous solution containing seawater or a seawater salt component, the Ca alginate film has a property of making the coexisting Ca impervious and selectively permeating Sr, and is solidified with an inorganic material. It was shown that by forming the surface layer of the Sr adsorbing member, the Sr adsorbing member produces an Sr selective adsorbent that adsorbs selectively permeated Sr in a state where Ca is impermeable. In the above description, a Ca alginate film is formed on the surface of a granular Sr adsorbing member that adsorbs selectively permeated Sr solidified with an inorganic material, and used in an aqueous solution containing seawater or a sea salt component. As a result, it was shown that a selective Sr adsorbent having a property of making Ca non-permeable and selectively allowing Sr coexisting with Ca to be produced is produced.

  By storing this Sr selective adsorbent 30 in the column 41, a collection and recovery device 40 for Sr from seawater is constructed.

  The apparatus 40 for collecting and collecting Sr from seawater delivers a column 41 for storing the Sr selective adsorbent 30, a heater 42 provided on the outer periphery of the column, a seawater introduction system 43 connected to the upper end of the column 41, and an Sr eluate 54. The Sr extract extract introduction system 44, the column pass solution discharge system 45 connected to the lower end of the column 41, and the Sr extract extract system 46 branched from the column pass solution discharge system 45. Porous materials 47 and 48 are provided at the upper and lower ends inside the column 41.

  The seawater introduction system 43 is connected to a seawater tank 51, and a pump 52 is disposed in the middle thereof. Real seawater is stored in the seawater tank 51.

The real sea ^water, and a case where the case of the actual sea water contaminated with 89 Sr and ^{90 Sr,} only strontium ^{Sr 2+} existing in nature without being contaminated with 89 Sr and ⁹⁰ Sr is present. These are referred to as Sr. In particular, when ⁸⁹ Sr and ⁹⁰ Sr that cause environmental pollution are included, they are referred to as ⁸⁹ Sr and ⁹⁰ Sr. In this example, the case where real seawater is used will be described, but an aqueous solution containing seawater salt may be used instead of real seawater.

  Therefore, the actual seawater is sucked up by the pump 52 from the seawater tank 51, guided to the column 41 through the seawater introduction system 43, and further through the three-way valve 53.

  The Sr eluate introduction system 44 is connected to a Sr extractant reservoir (not shown). The Sr eluate 54, for example, HCl sent from the Sr extraction reservoir is guided to the column 41 through the Sr eluate introduction system 44 and the three-way valve 53. The seawater tank and the Sr eluate are introduced by switching the three-way valve 53. At the time of elution of Sr, the heater 42 is actuated to heat the column 41 and facilitate extraction.

The Sr extract liquid discharge system 46 is branched from a three-way valve 55 provided in the column passage liquid discharge system 46. The Sr extract 57 is led to ⁸⁹ and ⁹⁰ Sr analysis means 59 through Sr purification means 58.

  The processed seawater discharged from the column passage liquid discharge system 46 is guided to the column passage liquid storage means 56 and stored as a column passage liquid.

  When the seawater is 40 L, 51,700 mg of Mg, 16,400 mg of Ca, and 320 mg of Sr are contained in this volume of seawater. The amount of Ca is much larger than the amount of Sr. There is more Mg.

Seawater flows through the column 41 at, for example, a space velocity of SV1.5 h ⁻¹ , but there is no problem even if the column 41 is enlarged according to the amount of sample to increase the space velocity.

  The Sr selective adsorbent 30 is housed in a column 41, seawater is injected into the column 41, and the inside of the column 41 is allowed to flow while contacting the Sr selective adsorbent 30, and the Ca alginate film contains Sr coexisting with Ca. While allowing selective permeation to arrive at the Sr adsorbing member 31, Ca coexisting with Sr is removed from the Ca alginate film 32 and remains in the aqueous solution, and the Sr adsorbing member 31 adsorbs the selectively permeated Sr. Thus, Sr is recovered from seawater using the Sr selective adsorbent. Sr can be collected and recovered by 95% or more.

  Next, Sr collected in the Sr selective adsorbent is extracted using the Sr eluate 54. The extraction of Sr is performed by introducing, for example, HCl into the column 41 from the Sr elution line 44.

  When the collected Sr is extracted, the Sr extract 57 contains impurities remaining in the column 41. Impurities discharged simultaneously with the Sr extraction are removed by the Sr purification means 58. By removing impurities in this way, Sr purification is performed, and Sr is separated and recovered. Thereby, Sr can be separated and recovered in the seawater in the column 41 using the Sr selective adsorbent.

  In this way, when the Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Ca alginate membrane has a property of making the coexisting Ca impervious and selectively permeating Sr, and is solidified with an inorganic material. By forming the surface layer of the Sr adsorbing member, the Sr adsorbing member is stored in the column with Sr selective adsorbent formed so as to adsorb selectively permeated Sr while Ca or Ca and Mg are impermeable. Then, when an aqueous solution containing seawater or a seawater salt component is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent, and Ca coexisting with a Ca alginate film, or Ca And the first step of allowing Sr to selectively permeate to reach the Sr adsorbing member and adsorb the selectively permeated Sr, impervious Ca, or Ca and Mg. Is allowed to remain in the aqueous solution containing seawater or seawater salt component, it is discharged from the column 41, a second step of recovering by extracting Sr adsorbed with Sr extract is formed.

  In addition, a third step of separating and collecting Sr, which is characterized in that the Sr extract is passed through an ion exchange resin and purified by Sr to separate and recover Sr, is formed.

When containing the ⁸⁹ Sr and ⁹⁰ Sr in sea water, separated, recovered Sr from ⁸⁹ Sr and ⁹⁰ Sr recovery rate ^{89, 90} Sr analysis means ⁸⁹ from the recovered Sr by analyzing at 59 Sr and ⁹⁰ Analyze Sr. From an aqueous solution comprising sea water or sea water salt component, or a Sr purified from an aqueous solution containing radioactive Sr analytes elute the daughter nuclide ^{90 Y} of ^{90 Sr} while holding the ion exchange resin, ⁹⁰ by measuring the ^{90 Y} Sr radioactivity is analyzed.

⁹⁰ Y separation / recovery and ⁹⁰ Y ( ⁹⁰ Sr) measurement can be performed according to ⁹⁰ Y separation / recovery and ⁹⁰ Y ( ⁹⁰ Sr) measurement shown in FIGS. That is, in FIG. 16 to FIG. 18, ⁹⁰ Sr is measured by incorporating refined Sr into process points indicated by arrows A, B, and C.

Thereby, when ⁸⁹ Sr and ⁹⁰ Sr are contained in the aqueous solution containing seawater and seawater salt components, the daughter of ⁹⁰ Sr in a state where purified Sr is retained in the ion exchange resin from the aqueous solution containing seawater and seawater salt components. The fourth step of analyzing the radioactivity of ⁹⁰ Sr is formed by eluting the nuclide ⁹⁰ Y and measuring ⁹⁰ Y.

According to the method for analyzing radioactive strontium according to the conventional method shown in FIGS. 16 to 18, complicated operations are required for the pretreatment process up to ⁹⁰ Y separation and recovery and ⁹⁰ Y ( ⁹⁰ Sr) measurement. 7 or more days are required, the amount of operation reagent is large, and the amount of secondary waste generated is also large. According to this embodiment, the pretreatment step is performed by using the Sr selective adsorbent described above. Is simplified, the pretreatment process can be sufficiently completed in one day, the amount of the operation reagent is small, and the secondary waste generated along with this is small. In particular, there is an advantage that Ca or Ca and Mg can be left in an aqueous solution containing seawater or seawater salt components, and can be handled as it is as an aqueous solution containing seawater or seawater salt components for disposal.

This analysis clarifies the decontamination status of ⁸⁹ Sr and ⁹⁰ Sr using the Sr selective adsorbent 30 when ⁸⁹ Sr and ⁹⁰ Sr are contained in the seawater.

Separation, the recovery rate of ⁸⁹ Sr and ⁹⁰ Sr from the recovered Sr analyzed by ^{89, 90} Sr analysis unit 59, a predetermined value or more ranges recoveries, in for example Sr collecting ^95%, 89 Sr and ⁹⁰ Continue decontamination of Sr. Thereby, decontaminated seawater characterized by being decontaminated seawater of ⁸⁹ Sr and ⁹⁰ Sr can be generated.

Thus, the separation, the recovery rate of ⁸⁹ Sr from the recovered Sr and ⁹⁰ Sr and ^{89, 90} Sr analysis, recovery rate continues to decontamination of ⁸⁹ Sr and ⁹⁰ Sr in a predetermined value or more ^ranges, 89 Sr And the 5th process refine | purified as the aqueous solution containing the decontaminated seawater and seawater salt component of ⁹⁰ Sr will be formed.

  Conventionally, it is difficult to separate Ca and Sr coexisting in an aqueous solution containing seawater or seawater salt components because both elements belong to the 2A group alkaline earth metal in the periodic table. However, according to this example, since the action of Ca as an inhibitory element can be eliminated without performing pretreatment, Sr can be easily and efficiently produced. It became possible to selectively separate. There is no accumulation of Ca that has been eliminated because it is not necessary to perform pretreatment.

  FIG. 8 is a diagram showing a method and conditions for testing the performance of removing Sr using seawater. 1) The column is provided with an Sr selective adsorbent as an example (however, zeolite A type is used as the Sr selective adsorption member). 2) A conventional Sr adsorbent was used for the column for comparison.

  FIG. 9 shows the Sr removal performance from seawater. Similar results are obtained using X-type zeolite.

  As shown in FIG. 9, according to this embodiment, it is understood that the Sr removal rate is maintained even when a large amount of seawater is passed. It can also be seen that the amount of Ca adsorbed on the Sr selective adsorbent is small.

FIG. 10 is a diagram showing an ⁸⁵ Sr-added seawater decontamination hot test method and conditions using an Sr selective adsorbent in the 1) column and 2) column. The reason why ⁸⁵ Sr, which is a γ-ray emitting nuclide, is used here is that ⁸⁹ Sr or ⁵⁰ Sr emits only β rays, and therefore preprocessing operations and measurement take time. The Sr selective adsorbent (however, A-type zeolite was used as the Sr selective adsorption member) as the present example was used, and the SV (space velocity) was changed.

FIG. 11 shows a seawater-added ⁸⁵ Sr decontamination test result.
As shown in FIG. 11, it can be seen that even if SV is changed, it is effective for ⁸⁵ Sr decontamination.

FIG. 12 shows the ⁸⁵ Sr analysis result of the column passing liquid.

FIG. 13 shows the ⁸⁵ Sr adsorption distribution in the column.

FIG. 14 shows the leaching state of adsorbed Sr when the Sr selective adsorbent adsorbing ⁸⁵ Sr is washed with seawater.
As shown in FIG. 14, the adsorbed ⁸⁵ Sr is not leached from the Sr selective adsorbent.

FIG. 15 shows another example of the embodiment of the present invention.
FIG. 15 is a diagram showing another example of the embodiment of the present invention. The other example shows that the present embodiment can be applied to the radioactive Sr analysis sample 70 in addition to the application of the seawater and the aqueous solution containing the sea salt component shown in FIG.

  Examples of radioactive Sr analysis samples 70 include fallout, airborne dust, clean water, freshwater (river water, etc.), seawater, soil, seabed soil, daily food, rice, milk, powdered milk, root vegetables, leaf vegetables, tea, freshwater fish. , Sea charcoal fish, shellfish, seaweed, but are not limited to these. Except for the water sample (clean water, fresh water, seawater), pretreatment for dissolution of Sr in the sample is performed to obtain an Sr solution 71 in the sample.

According to the example shown in FIG. 15, when an aqueous solution containing a radioactive Sr analysis sample that does not contain seawater or a seawater salt component is injected into the column 41, the column 41 is selected as Sr. The Ca alginate film is allowed to flow while contacting with the adsorbent, and is selectively used as a step of allowing Sr to selectively permeate and reach the Sr adsorbing member to adsorb the selectively permeated Sr.
The second step is a step of collecting and collecting the Sr that is left in the aqueous solution containing the impervious radioactive Sr analysis sample, discharged from the column 41, and extracted with the Sr eluent 57. Will be used in parallel. “Common use” means that any adsorption operation can be used.

In the first step, when an aqueous solution containing a radioactive Sr analysis sample that does not contain seawater or seawater salt components is injected into the column 41, the column is allowed to flow while contacting the Sr selective adsorbent 30. The Ca alginate membrane selectively permeates Sr to reach the Sr adsorbing member and adsorbs selectively permeated Sr.
In the second step, the Sr remaining in the aqueous solution containing the impermeable radioactive Sr analysis sample, discharged from the column, and adsorbed Sr is extracted using the Sr extract. In this case, ⁹⁰ Sr radioactivity is analyzed by eluting ⁹⁰ Sr daughter nuclide ⁹⁰ Y in a state where Sr purified from an aqueous solution containing a radioactive Sr analysis sample is held in an ion exchange resin, and measuring ⁹⁰ Y. A fourth step can be formed.

30 ... Sr selective adsorbent, 31 ... Sr adsorbing member, 32 ... Ca alginate membrane, 40 ... seawater Sr trapping device, 41 ... column, 43 ... seawater introduction system, 44 ... Sr eluate introduction system, 45 ... column passage liquid Discharge system, 46 ... Sr extract discharge system, 54 ... Sr eluate (HCl), 56 ... Column passage liquid storage means, 57 ... Sr extract, 58 ... purification means, 59 ... ^{89, 90} Sr analysis means.

Claims (13)

When a Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Sr adsorbing member solidified with an inorganic material has a property of making the coexisting Ca impermeable and selectively allowing Sr to permeate. By forming a surface layer, the Sr adsorbing member accommodates a Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state where Ca is impermeable, and the seawater or sea salt component is stored in the column. When an aqueous solution containing water is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent to eliminate the adsorption of Ca coexisting with the Ca alginate film, thereby selecting Sr. A first step of allowing the Sr adsorbing member to permeate and adsorb the selectively permeated Sr;
The impervious Ca consists of a second step in which it remains in an aqueous solution containing seawater and seawater salt components, is discharged from the column, and the adsorbed Sr is extracted using an Sr extract. A method for collecting and collecting Sr. When a Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Sr adsorption solidified with an inorganic material has the property of making the coexisting Ca and Mg impervious and selectively permeating Sr. By forming the surface layer of the member, the Sr adsorbing member accommodates the Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state in which Ca and Mg are impermeable, and the seawater is stored in the column. When an aqueous solution containing seawater and salt components is injected into the column, the column is allowed to flow while in contact with the Sr selective adsorbent, thereby eliminating adsorption of Ca and Mg in which the Ca alginate film coexists. A first step of allowing permeation, selectively permeating Sr to reach the Sr adsorbing member, and adsorbing selectively permeated Sr;
The impervious Ca and Mg remain in an aqueous solution containing seawater and seawater salt components, and are discharged from the column, and the second step is to recover the adsorbed Sr by extracting it with the Sr extract. A method for collecting and collecting Sr, characterized by the following. In Claim 1, when the aqueous solution containing the radioactive Sr analysis sample which does not contain seawater or seawater salt components in the column is injected into the column, the inside of the column is brought into contact with the Sr selective adsorbent. The Ca alginate film is allowed to flow through while allowing the Sr to selectively permeate to reach the Sr adsorbing member, and is also used as a step of adsorbing the selectively permeated Sr.
The second step is also used as a step of recovering by leaving the column in an aqueous solution containing an impermeable radioactive Sr analysis sample, discharging from the column, and extracting the adsorbed Sr using an Sr extract. A method for collecting and collecting Sr, characterized by the following. In Claim 2, when the aqueous solution containing the radioactive Sr analysis sample which does not contain seawater or seawater salt components in the column is injected into the column, the inside of the column is brought into contact with the Sr selective adsorbent. The Ca alginate film selectively permeates Sr to reach the Sr adsorbing member, adsorbs the selectively permeated Sr,
In the second step, the Sr is recovered by being left in an aqueous solution containing an impermeable radioactive Sr analysis sample, discharged from the column, and extracting the adsorbed Sr using an Sr extract. Collection and recovery methods.   5. The method for separating and recovering Sr according to any one of claims 1 to 4, wherein the Sr extract is passed through an ion exchange resin and purified by Sr to separate and recover Sr. A Sr separation and recovery method comprising three steps. In Claim 5, when ⁸⁹ Sr and ⁹⁰ Sr are contained in the aqueous solution containing seawater or seawater salt components, Sr purified from the aqueous solution containing seawater or seawater salt components or from the aqueous solution containing radioactive Sr analysis samples is obtained. It was recovered, characterized in that it had a fourth step of eluting the ⁹⁰ Sr daughter nuclide ⁹⁰ Y while being held in the ion exchange resin, and analyzing the ^{90 S} radioactivity by measuring ⁹⁰ Y. Method for analyzing ⁹⁰ Sr from Sr. 6. The method according to claim 5, wherein the third step includes decontamination of ⁸⁹ Sr and ⁹⁰ Sr when ⁸⁹ Sr and ⁹⁰ Sr are contained in an aqueous solution containing seawater or a sea salt component. ⁸⁹ Sr and ⁹⁰ Sr decontamination method. In claim 6, the recovery rate of ⁸⁹ Sr and ⁹⁰ Sr from the recovered Sr is evaluated to continue the decontamination of ⁸⁹ Sr and ⁹⁰ Sr in a range of more than recoveries predetermined ^value, the 89 Sr and ⁹⁰ Sr A method for purifying an aqueous solution containing seawater and seawater salt components, comprising a fifth step of refining as an aqueous solution containing decontaminated seawater and seawater salt components. When a Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Sr adsorbing member solidified with an inorganic material has a property of making the coexisting Ca impermeable and selectively allowing Sr to permeate. By forming a surface layer, the Sr adsorbing member accommodates a Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state where Ca is impermeable, and the seawater or sea salt component is stored in the column. When an aqueous solution containing water is injected into the column, the column is allowed to flow while contacting the Sr selective adsorbent to eliminate the adsorption of Ca coexisting with the Ca alginate film, thereby selecting Sr. Sr adsorbing means for allowing permeation to reach the Sr adsorbing member and adsorbing selectively permeated Sr;
Impervious Ca is made up of recovery means for remaining in an aqueous solution containing seawater and seawater salt components, discharging from the column, and recovering the adsorbed Sr by extracting with Sr extract. Sr collection and recovery equipment. When a Ca alginate membrane is used in an aqueous solution containing seawater or a seawater salt component, the Sr adsorption solidified with an inorganic material has the property of making the coexisting Ca and Mg impervious and selectively permeating Sr. By forming the surface layer of the member, the Sr adsorbing member contains a column containing Sr selective adsorbent formed so as to adsorb selectively permeated Sr in a state of impervious to Ca and Mg, When an aqueous solution containing seawater and salt components is injected into the column, the column is allowed to flow while in contact with the Sr selective adsorbent, thereby eliminating adsorption of Ca and Mg in which the Ca alginate film coexists. Sr adsorbing means that permeates, selectively transmits Sr to reach the Sr adsorbing member, and adsorbs selectively transmitted Sr;
Impervious Ca and Mg remain in an aqueous solution containing seawater and seawater salt components, are discharged from the column, and are composed of recovery means for recovering the adsorbed Sr by extracting it with an Sr extract. Characteristic Sr collection and recovery device. 10. The Sr adsorption means according to claim 9, wherein when an aqueous solution containing radioactive Sr analysis material not containing seawater or seawater salt components is injected into the column, the Sr selective adsorbent is contacted in the column. The Ca alginate film is allowed to pass through selectively while allowing Sr to selectively permeate to reach the Sr adsorbing member and adsorb the selectively permeated Sr.
It is also used as a step in which the collecting means is left in an aqueous solution containing a non-permeable radioactive Sr analysis sample, discharged from the column, and recovered by extracting the adsorbed Sr using a Sr extract. Sr collection and recovery device characterized by the above. The said Sr adsorption | suction means contacts the said Sr selective adsorption agent in the said column, when the aqueous solution containing the radioactive Sr analysis sample which does not contain seawater and a seawater salt component in the said column is inject | poured in this column. The Ca alginate film selectively permeates Sr to reach the Sr adsorbing member, adsorbs the selectively permeated Sr,
In the second step, the Sr is recovered by being left in an aqueous solution containing an impermeable radioactive Sr analysis sample, discharged from the column, and extracting the adsorbed Sr using an Sr extract. Collection and collection device. In any one of claims 9 to 12, the Sr extract is passed through an ion exchange resin and purified by Sr to separate and recover Sr. When ⁸⁹ Sr and ⁹⁰ Sr are contained in an aqueous solution containing seawater or a sea salt component, Sr purified from the aqueous solution containing the sea water or sea salt component or from an aqueous solution containing a radioactive Sr analysis sample is retained in an ion exchange resin. ⁹⁰ Sr of ⁹⁰ Sr from recovered Sr, characterized in that it comprises an analyzer that elutes ⁹⁰ Sr daughter nuclide ⁹⁰ Y and analyzes ^{90 S} by measuring ⁹⁰ Y Analysis equipment.

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