JP6467577B2 - Soil pore water collection device, soil pore water sulfide measurement device, and soil pore water dissolved ion measurement device - Google Patents

Description

  The present invention relates to a soil pore water collection device, a soil pore water sulfide measuring device, and a soil pore water dissolved ion measuring device. Specifically, while having a simple structure, soil pore water such as bottom sludge can be collected appropriately, and soil pore water sampling equipment that can accurately measure the dissolved concentration of sulfides, etc., soil pore water sulfide measurement The present invention relates to an apparatus and a dissolved ion measuring apparatus for soil pore water.

  In sediment such as river mud in rivers, soil pore water exists between particles constituting the sediment. Soil pore water under a reducing atmosphere contains sulfides such as hydrogen sulfide due to the action of sulfate-reducing bacteria, which are absolute anaerobic bacteria.

  Since hydrogen sulfide and the like are toxic substances for many benthic organisms, the concentration of sulfide contained in the soil interstitial water is an important index for evaluating the environment. In addition to sulfides, soil pore water contains components such as dissolved iron and anaerobic bacteria, and soil pore water is an important sample for evaluating environments such as tidal flats and water bottoms.

  Here, sulfides and the like contained in the soil interstitial water are rapidly oxidized when they come into contact with oxygen in the air, and accurate concentration measurement cannot be performed. For this reason, in collecting soil interstitial water, it is required to reduce the influence of oxygen in the air.

  Under such circumstances, a method of anaerobically extracting dissolved sulfides in soil interstitial water using deoxygenated water has been proposed. For example, there is a method described in Non-Patent Document 1.

  In the method described in Non-Patent Document 1, a deposit sample is placed in a highly airtight syringe, and deoxygenated water is injected therein using another syringe. Further, by filtering from syringe to syringe, the dissolved sulfide in the soil pore water is extracted without touching the air.

  The collected sample is colored with a known reagent such as methylene blue absorptiometry and the ion concentration is measured. At this time, if excessive particles or the like are included in the sample, turbidity is generated, and accurate concentration measurement cannot be performed. Therefore, it is necessary to filter the sample.

Shogo Sugawara et al. Simple on-site extraction / spectrophotometric determination of dissolved sulfide in sand and mud sediments and its application to sediments in northeast Ariake Sea BUNSEKI KAGAKAKU Vol.59, No.12, pp.1155-1161 (2010)

  However, in the method described in Non-Patent Document 1, the instrument configuration is complicated, and the procedure for extracting deoxygenated water is essential, so the procedure is complicated. It is conceivable that a skilled technique is required for the operation of putting the collected sample in a syringe and proceeding with extraction quickly.

  Further, the method described in Non-Patent Document 1 has a disadvantage that the concentration of the collected dissolved sulfide cannot be measured immediately on site. The extracted dissolved sulfide is once fixed as zinc sulfide, the brought-back one is eluted again with hydrochloric acid, and the absorbance is measured using a coloring reagent.

  In the above series of operations, an apparatus such as a reagent or an absorptiometer is required. In addition, a certain level of expertise and technique for accurately performing the operation procedure is required, and it is not a method that anyone can easily implement. Furthermore, since no results can be obtained at the site, it can be said that the speed and simplicity are insufficient.

  The present invention was devised in view of the above points, and while having a simple structure, it is possible to appropriately collect soil pore water such as bottom sludge and accurately measure dissolved concentrations of sulfides and the like. The present invention relates to a soil pore water collection device, a soil pore water sulfide measurement device, and a soil pore water dissolved ion measurement device.

  In order to achieve the above object, the soil interstitial water collection device of the present invention is a substantially flat main body, formed with a sharp end and a space inside, and capable of filtering predetermined particles. A filtration part, a tubular body having a through hole, a tube part having one end inserted into the filtration part, at least a part of the periphery of the filtration part, and the filtration part of the tube part And a bag-like body located on the other end side of the tube part, and the inside is the above-mentioned A sample collection portion formed in communication with the through hole of the tube portion.

  Here, the filtration part is a substantially flat main body, one end is sharp and has a space inside, and is configured so that predetermined particles can be filtered. Can be filtered. That is, both surfaces of the substantially flat main body come into contact with soil pore water, and filtration is possible at the same portion. Since the filtered sample water does not contain extra particles, it can be used for ion measurement such as a known methylene blue absorptiometry.

  Moreover, since the filtration part is a substantially flat main body and one end is sharply formed, the filtration part pierces water mud or the like and easily reaches a portion where soil pore water exists.

  Moreover, while being a cylindrical body which has a through-hole, it is a tube part which the one end side was inserted in the inside of a filtration part, and a bag-like body located in the other end side of a tube part, and an inside is penetration of a tube part The sample collection part formed in communication with the holes makes it possible to suck and collect soil pore water while filtering. That is, by sandwiching the sample collection part with a finger, a suction force is generated to take moisture into the tube part and the sample collection part, and the water filtered by the filtration part is stored.

  Also, at least a part of the periphery of the filtration unit and the region in contact with the filtration unit of the tube unit are bonded, and only the moisture filtered by the filtration unit is filtered through the filtration unit by the sealing unit. Only the remaining water enters the sample collection section.

  Moreover, when the sample collection part is formed with a soft resin, it is possible to generate a suction force for sucking in soil pore water more easily. Moreover, the influence which it has on ion concentration measurement can be reduced by selecting resin according to the kind of ion used as the measuring object in soil pore water.

  Moreover, when the inside of a sample collection part and a tube part is filled with inert gas, the influence of the oxygen in the air with respect to the collected sample can be reduced. For example, it is possible to reduce the influence of oxygen on sulfide ions and the like that react with oxygen, and to provide the ion concentration measurement, thereby contributing to accurate concentration measurement. In addition, the collection | recovery apparatus with which the inert gas was filled inside can maintain a reduction | restoration state by enclosing with a deoxygenating agent in the gas-barrier bag which is hard to permeate | transmit gas, for example.

  Moreover, when a filtration part is processed with the water repellent, it becomes possible to insert in soil sludge etc. which become object, maintaining the hardness of a filtration part, and it becomes much easier to sample. That is, for example, when the filtration part is formed of filter paper, it becomes easy to keep the hardness of the filter paper in contact with water.

In addition, when the filtration part is formed to have an area of about 3 cm ² in plan view and the sample collection part can accommodate about 2 ml of water inside, it is easy to obtain an appropriate amount of sample in a short time. It becomes. That is, for example, from the relationship between the area of the filtration unit and the amount of sample to be collected, sampling in a short time of about several minutes is possible with the suction force generated by sandwiching the sample collection unit with a finger. Moreover, compared with the case where a large amount of soil pore water is collected from one place, it is possible to reduce the possibility of the lack of pore water at the target location and the possibility of pore water flowing in from the surrounding area and affecting accurate concentration measurement. .

  In order to achieve the above object, the soil interstitial water sulfide measuring device of the present invention is a substantially flat main body, one end is sharp and has a space inside, and predetermined particles are formed. A tubular part having a filtration part configured to allow filtration and a through-hole, one end side inserted into the inside of the filtration part, at least a part of the periphery of the filtration part, and the tube part And a bag-like body located on the other end side of the tube part, and a sealing part for adhering a region in contact with the filtration part, allowing only the water filtered by the filtration part to permeate inside. , A soil pore water collection device having a sample collection part formed inside and communicating with the through hole of the tube part, and the sulfide concentration in the moisture collected in the sample collection part can be measured A detection mechanism.

  Here, the filtration part is a substantially flat main body, one end is sharp and has a space inside, and is configured so that predetermined particles can be filtered. Can be filtered. That is, both surfaces of the substantially flat main body come into contact with soil pore water, and filtration is possible at the same portion. Since the filtered sample water does not contain extra particles, it can be used for ion measurement such as a known methylene blue absorptiometry.

  Moreover, while being a cylindrical body which has a through-hole, it is a tube part which the one end side was inserted in the inside of a filtration part, and a bag-like body located in the other end side of a tube part, and an inside is penetration of a tube part The sample collection part formed in communication with the holes makes it possible to suck and collect soil pore water while filtering. That is, by sandwiching the sample collection part with a finger, a suction force is generated to take moisture into the tube part and the sample collection part, and the water filtered by the filtration part is stored.

  Moreover, it becomes possible to measure the sulfide concentration contained in the soil interstitial water by the detection mechanism capable of measuring the sulfide concentration in the water collected in the sample collection part. The detection mechanism referred to here means a known sulfide concentration measurement kit that can be used at the sampling site and can immediately provide the sample to the test. For example, it is possible to use a sample whose color can be measured by reacting the reagent with the sample and comparing the color of the sample based on the generated methylene blue, that is, the color corresponding to the sulfide concentration with a standard color chart.

  In order to achieve the above object, the dissolved ion measuring apparatus for soil pore water of the present invention is a substantially flat main body, one end is sharp and has a space inside, and predetermined particles are formed. A tubular part having a filtration part configured to allow filtration and a through-hole, one end side inserted into the inside of the filtration part, at least a part of the periphery of the filtration part, and the tube part And a bag-like body located on the other end side of the tube part, and a sealing part for adhering a region in contact with the filtration part, allowing only the water filtered by the filtration part to permeate inside. A soil interstitial water collection device having a sample collection part formed inside and communicating with the through hole of the tube part, and a detection capable of measuring dissolved ions of water collected in the sample collection part And a mechanism.

  Here, the concentration of dissolved ions contained in the soil interstitial water can be measured by a detection mechanism capable of measuring the dissolved ions of water collected in the sample collection unit. The detection mechanism here means a known ion concentration measurement kit or the like that can be used at the sampling site and can immediately give the sample to the test. For example, when divalent iron ions or trivalent iron ions are measured as dissolved ions, the reagent is reacted with the sample, and the sample color based on the generated colored compound, that is, the concentration of divalent iron ions or trivalent iron ions is adjusted. A color that can be measured by comparing the corresponding color with a standard color chart can be used.

  In addition, in order to achieve the above object, the soil pore water collecting method of the present invention, the tip of the tube part covered with a filtration part capable of filtering predetermined particles is inserted into the soil, and the filtration part And a step of collecting moisture in a sample collecting part filled with an inert gas while filtering.

  Here, the soil interstitial water to be collected can be filtered by a tube portion covered with a filtration portion capable of filtering predetermined particles.

  In addition, by collecting moisture in the sample collection unit filled with an inert gas while filtering through the filtration unit, it is possible to reduce the influence of oxygen in the air on the collected sample and collect the sample. . For example, it is possible to reduce the influence of oxygen on sulfide ions and the like that react with oxygen, and to provide the ion concentration measurement, thereby contributing to accurate concentration measurement.

  Further, in order to achieve the above object, the soil pore water sulfide concentration measurement method of the present invention, the tip of the tube part covered with a filtration part capable of filtering predetermined particles is inserted into the soil, A collection step of collecting moisture in a sample collection portion filled with an inert gas while filtering through the filtration portion, and a sulfide concentration in the moisture collected in the collection step is changed to a methylene blue colorimetric method. And a concentration measuring step for measuring based on.

  Here, the sulfide concentration contained in the soil pore water can be measured by the concentration measurement step of measuring the sulfide concentration in the water collected in the collection step based on the methylene blue colorimetric method. The concentration measurement step means concentration measurement using a known sulfide concentration measurement kit or the like that can be used at the sampling site and can immediately give the sample to the test. For example, it is possible to use a sample whose color can be measured by reacting the reagent with the sample and comparing the color of the sample based on the generated methylene blue, that is, the color corresponding to the sulfide concentration with a standard color chart.

The soil interstitial water collection device according to the present invention can appropriately collect soil interstitial water such as bottom sludge and can accurately measure dissolved concentrations of sulfides and the like.
The sulfide interstitial water sulfide measuring device according to the present invention can appropriately collect soil interstitial water such as bottom sludge and can accurately measure the dissolved concentration of sulfides and the like.
Moreover, the dissolved ion measuring apparatus for soil pore water according to the present invention can appropriately collect soil pore water such as bottom sludge and can accurately measure the concentration of dissolved ions.

It is the schematic which shows the pore water sampler to which this invention is applied. It is the schematic (a)-(d) which shows the flow of preparation of the structure of the front-end | tip part of a sampler. It is the schematic which shows a mode that the soil pore water in the water sludge of a river is collected with a sampler. It is the schematic (a)-(d) which shows the flow of an example of the measurement of the sulfide density | concentration of a sample.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to facilitate understanding of the present invention.
FIG. 1 is a schematic view showing a pore water sampler to which the present invention is applied. In addition, the structure shown below is an example of this invention and the content of this invention is not limited to this.

  As shown in FIG. 1, a pore water sampler 1, which is an example of a soil pore water collection device to which the present invention is applied, includes a filtration unit 2, a tube unit 3, and a collection unit 4.

The filtration unit 2 is formed of a filter paper having a reserved particle diameter of 5 μm for qualitative analysis. The filtration unit 2 has a front surface and a back surface, and both surfaces are portions that filter soil interstitial water. The area of each plane is about 3 cm ² .

  The filtration part 2 is formed from one filter paper, and one end has a sharp shape. Moreover, the internal space enclosed by the filtration part 2 is separated from the external space by sealing with the filtration part and the adhesive agent mentioned later. That is, only the water filtered by the filtering unit 2 is transmitted through the filtering unit 2.

  Further, the peripheral edge 5 on one end side of the filtration unit 2 is formed in a substantially linear shape. Further, a water repellent treatment is performed on the filtration unit 2 by spraying a water repellent made of polytetrafluoroethylene.

  Here, the filtration unit 2 does not necessarily need to be formed of a filter paper having a reserved particle diameter of 5 μm for qualitative analysis, and can be filtered within a range in which ions contained in the collected sample can be analyzed. Is enough. It is also possible to employ finer filter paper. However, it is preferable to employ a filter paper having a reserved particle diameter of about 5 μm as an efficient filter paper that enables ion analysis.

  Moreover, the filtration part 2 does not necessarily need to be formed from one sheet of filter paper, and the filtration part 2 can be formed by joining a plurality of filter papers with an adhesive or the like. However, it is preferable that the filtration part 2 is formed from one filter paper from the point that the area | region which performs filtration can fully be ensured and the effort of preparation becomes easy.

  In addition, the peripheral edge 5 on one end side of the filtration unit 2 is not necessarily formed in a substantially linear shape. For example, the arcuate shape of the filter paper may be left as it is. However, it is preferable that the peripheral edge 5 on one end side of the filtration part 2 is formed in a substantially linear shape from the viewpoint that the adhesive 6 can be easily applied to the peripheral edge 5 portion.

  Further, the water repellent made of polytetrafluoroethylene is not necessarily applied to the filtration unit 2 and the water repellent treatment need not be performed. However, it is preferable that the filtration unit 2 is subjected to water repellent treatment from the viewpoint that the water resistance of the filtration unit 2 when touched with water is improved and the sludge can be easily excavated. Further, the water repellent treatment is not limited to spraying, and can be performed by application of a water repellent.

  The tube part 3 and the collection part 4 are syringes formed integrally. The dropper is made of polyethylene. By sandwiching the collection unit 4 with a finger, the gas inside the collection unit 4 is discharged to the outside, and when the collection unit 4 returns to its original shape, soil pore water is introduced from the tip of the tube unit 3 to the inside. It is to be inhaled.

  The tube portion 3 is a cylindrical body having an inner diameter of about 2 mm and a length of about 10 cm, and is inserted into a region surrounded by the filtration portion 2 at one end side, that is, the inside of the filtration portion 2. Moreover, the collection part 4 becomes a magnitude | size which can accommodate a sample of about 2 ml.

  Here, the tube part 3 and the collection part 4 do not necessarily need to be an integrally formed dropper, and may have a structure in which the individual tube part and the collection part are connected. However, since it can be easily obtained with a dropper and is suitable as a structure for sucking soil pore water with a weak suction force as described later, the tube portion 3 and the collecting portion 4 are integrally formed. It is preferable to be a dropper.

  Moreover, the magnitude | size of the tube part 3 and the collection part 4 is not limited. The size can be appropriately changed according to the amount of sample necessary for concentration measurement. However, if it is a sulfide measurement kit or the like that measures the concentration immediately at the sampling site, if the collection unit 4 has a sample of about 2 ml, it can be sufficiently used for concentration measurement. Yes. Further, by reducing the inner diameter of the tube portion 3, the structure in which the tube portion 3 and the collection portion 4 are filled with nitrogen can be easily maintained.

  One end of the tube part 3 is inserted from one end side of the filtration part 2. The peripheral edge 5 on one end side of the filtration part 2 is sealed with an adhesive 6 in a state where the tube part 3 is inserted. Although the structure of this point will be described later, the filtering unit 2 is formed by sealing the opening of a folded filter paper with an adhesive 6.

  Moreover, the gas inside the tube part 3 and the collection part 4 is filled with nitrogen gas. The interstitial water sampler 1 before use is placed in a gas barrier sealing bag (not shown) with a chuck.

  The enclosed bag is filled with an oxygen scavenger so that the reduced state inside the bag can be maintained. Furthermore, the oxygen detecting agent is also put in the enclosing bag so that, for example, the color change of the oxygen detecting agent can be confirmed in response to 0.1% or more of oxygen. Thereby, quality control of the pore water sampler 1 becomes possible.

  Here, the interstitial water sampler 1 does not necessarily need to be stored in a gas barrier sealed bag with a chuck, and it is sufficient if the interstitial water sampler 1 can be stored so that the reduced state can be maintained.

  Hereinafter, the manufacturing procedure of the pore water sampler 1 which is an example of the soil pore water collection device to which the present invention is applied will be described. In addition, the manufacturing procedure shown below is an example to the last, and the manufacture of the pore water sampler 1 is not limited to this.

  As shown in FIG. 2A, the filtration unit 2 is formed with filter paper 7. One circular filter paper 7 is folded so that the arc portions overlap each other, so that a substantially conical shape 8 having a predetermined size is obtained (see FIG. 2B).

  Then, as shown in FIG. 2 (c), one end of the tube portion 3 is inserted into the internal space surrounded by the substantially conical shape 8 filter paper. Further, the substantially conical shape 8 is crushed into a flat surface with one end of the tube portion 3 inserted, and the arc-shaped portion is cut into a substantially straight line.

Thereby, as shown in FIG.2 (d), the shape of the filtration part 2 which has a square-shaped front and back in planar view is formed. Moreover, the area of the filtration part 2 of planar view becomes about 3 cm < ² > here. Further, the part that has been cut off becomes the above-described peripheral edge 5.

  Subsequently, in this state, a vinyl acetate emulsion adhesive 6 is applied along the peripheral edge 5 of the filter paper. Further, the adhesive 6 is sufficiently applied also to a region where the tube portion 3 and the filter paper are in contact. By applying the adhesive 6, the opening portion of the filter paper is sealed with the tube portion 3 interposed therebetween. After application of the adhesive 6, the bonded portion is fixed from the outside with a clip or the like to complete the bonding.

  By applying the adhesive 6, the opening portion of the filter paper is sealed with the tube portion 3 interposed therebetween, and the filtration portion 2 is completed. As described above, the inside of the filtration unit 2 is separated from the inside and outside by the filtration unit and the sealed peripheral edge 5, and only the water filtered by the filtration unit 2 permeates the inside of the filtration unit 2.

  The dropper to which the filtration unit 2 is attached is placed in a sealed space in which nitrogen gas can be supplied. By supplying nitrogen for a certain period of time, the inside of the dropper is filled with nitrogen and is in a nitrogen-substituted state. After that, it is put in an encapsulating bag having gas barrier properties to be in a state before use.

  Subsequently, a series of flow from soil pore water sampling to concentration measurement using the soil pore water sulfide measuring apparatus to which the present invention is applied will be described. Below, the flow which measures the sulfide density | concentration of the soil pore water of object environment using the pore water sampler 1 demonstrated so far is shown. The series of flows shown below is merely an example of sulfide measurement using the present invention, and the content of the present invention is not limited to this.

  As shown in FIG. 3, the tip of the filtration unit 2 of the pore water sampler 1 is inserted into the bottom sludge 9 in the bottom environment where the sulfide concentration is to be measured. Soil pore water 10 exists between particles of various sizes constituting the bottom sludge 9. Further, the inside of the bottom sludge 9 has a reducing atmosphere in which almost no oxygen is present.

  Moreover, since the bottom sludge 9 is soft, even if it is the hardness which the filtration part 2 of the pore water sampler 1 has, it can insert easily. The filtration part 2 is inserted into the bottom sludge 9 and the part of the collection part 4 is sandwiched with a finger at a part that reaches a depth of about 10 cm from the surface layer, thereby generating a dropper suction force.

  The soil pore water 10 located around the filtration unit 2 is sucked by the suction force that sucks moisture from the tip of the tube unit 3 to the inside of the collection unit 4. Moreover, the soil interstitial water 10 comes into contact with the filtration unit 2, is filtered on the surface thereof, and only water from which particles of a certain size or larger are removed permeates into the filtration unit 2.

  Moisture that has passed through the filtration unit 2 is slowly sucked from the tip of the tube unit 3 toward the collection unit 4 and finally collected in the internal space of the collection unit 4. The collecting unit 4 stores water that is about 2 ml of sample. The 2 ml collection is complete within 10 minutes.

  Although sulfides and the like contained in the collected water have a property of being rapidly oxidized with oxygen, the inside of the tube part 3 and the collection part 4 is filled with nitrogen gas, so that oxidation hardly occurs. It has become a thing. The collected moisture of the sample can be measured at the site while reducing the influence of oxygen by using a known sulfide concentration measurement kit.

At the time of sampling described above, one surface of the filtration unit 2 has an area of about 3 cm ² , so that the soil pore water 10 around the filtration unit 2 can be efficiently filtered. If a sample of about 2 ml can be collected in the collection unit 4, it can be sufficiently provided for the measurement of sulfide concentration, and therefore the size of the filtration unit 2 has a sufficient filtration area.

  Moreover, the dropper which consists of the tube part 3 and the collection part 4 becomes a thing with a very weak suction | attraction force produced when the collection part 4 is pinched with a finger | toe. That is, the filtration of the soil interstitial water 2 in the filtration part 2 proceeds slowly, and the filtration part 2 is not easily clogged.

  If the suction force acting on the soil interstitial water 10 is too strong, it will lead to clogging of the filtration in the filtration unit 2 or damage to the filtration unit 2, so the weak suction force generated by pinching the dropper with your finger is suitable. ing.

  Moreover, even if the bottom of the water from which soil interstitial water is desired to be collected is sandy to a certain degree of hardness, it can be sufficiently inserted as long as the filtration unit 2 has been subjected to water repellent treatment. Furthermore, in the case of an environment with a harder gravel, it is also possible to insert the pore water sampler 1 while assisting with a metal spatula or the like.

  The measurement of the sulfide concentration of the moisture of the sample collected in the process described above will be described.

  Here, the concentration of hydrogen sulfide, water sulfide ions, and sulfide ions in the moisture of the sample is simply measured using a known sulfide concentration measurement kit. This method is based on the methylene blue colorimetric method.

  First, as shown in FIG. 4A, the collection unit 4 is pinched with a finger, and the moisture 11 of the collected sample is discharged into the container 12. At this time, the distal end side of the tube portion 3 is cut and the portion of the filtration portion 2 is cut off. The amount of water put into the container 12 is the amount specified by the measurement kit. Subsequently, the reaction reagent 13 is added to the container 12. The reaction reagent 13 contains N, N-dimethyl-p-phenylenediamine.

  As shown in FIGS. 4B and 4C, the sample tube 15 having the through hole 14 is unplugged, and the tube is pinched with a finger to mix the sample water 11 and the reaction reagent 13 in the container 12. Aspirate. At the time of suction, all the water in the container 12 is sucked.

  Then, as shown in FIG.4 (d), the sample tube 15 is shaken several times and internal water | moisture content is mixed well. The sulfide ions contained in the sample react with the reaction reagent 13 to generate methylene blue. Further, the sample is colored to reflect the concentration of the generated methylene blue.

  A few minutes after stirring, the color described in a standard color chart (not shown) is compared with the color of moisture inside the sample tube 15. The standard color chart includes a plurality of colors according to the sulfide concentration, and it is possible to determine the concentration of the sulfide from the ones with similar colors. Further, the concentration can be measured in the order of ppm, and when the sulfide concentration of the target sample is high, an appropriate concentration measurement can be performed by diluting and testing.

  The series of operations described above is very simple and can be completed within a few minutes after collecting the moisture of the sample with the pore water sampler 1, and no special technique is required for the operation itself. It has become a thing.

  In the above description, the case where the sulfide concentration is measured immediately at the sampling site has been described. However, it is also possible to store the moisture of the sample in the pore water sampler 1.

  For example, if the dropper of the pore water sampler 1 is formed of a thermoplastic resin, a part of the tube portion 3 can be thermally welded with a device such as a manual sealer to enclose the sample water inside the dropper. It becomes. The sample stored in this way can be taken home and used for measurement of sulfide concentration indoors. Further, the concentration can be measured in more detail using an instrument such as an absorptiometer. In this case, the sampled moisture can be measured by an official method defined in JIS K0102, not by a known sulfide measurement kit.

  The pore water sampler described above can collect soil pore water efficiently and easily. Moreover, since nitrogen gas is filled inside, it is possible to hold an object to be measured, which is easily oxidized, contained in the soil interstitial water in a reducing atmosphere. As a result, it contributes to accurate measurement of the sulfide concentration and the like.

  Further, by using it in combination with a known sulfide concentration measurement kit, it becomes possible to perform measurement immediately at the measurement site. In addition, since it has a simple configuration, anyone can easily perform measurement without requiring a special technique.

  Furthermore, since the pore water sampler has a size that can be easily used, the sulfide concentration can be efficiently measured at a plurality of locations where the environmental investigation is performed. Moreover, since the amount of moisture in the sample to be collected is small, soil pore water in the target environment can be collected appropriately.

  In the present invention, the measurement target is not limited to soil pore water sulfide, but can also be used for detection of other dissolved ions contained in soil pore water, concentration measurement, and collection of anaerobic bacteria. . For example, iron ions such as divalent iron ions and trivalent iron ions contained in soil pore water are also targeted. In this case, similarly to the measurement of sulfide concentration, it can be easily measured by using a known concentration measurement kit that detects iron ions based on a colorimetric reaction.

  In addition, as described above, by holding and returning soil pore water collected in a pore water sampler in which the tube portion is closed by heat welding or the like, iron ions are obtained by the phenanthroline spectrophotometric method defined in the official method defined in JIS K0102. Can also be analyzed.

As described above, the soil interstitial water collecting apparatus of the present invention can appropriately collect soil interstitial water such as bottom sludge and can accurately measure dissolved concentrations of sulfides and the like.
The sulfide interstitial water sulfide measuring device according to the present invention can appropriately collect soil interstitial water such as bottom sludge and can accurately measure the dissolved concentration of sulfides and the like.
Moreover, the dissolved ion measuring apparatus for soil pore water according to the present invention can appropriately collect soil pore water such as bottom sludge and can accurately measure the concentration of dissolved ions.

  Examples of the present invention will be described below.

Using the soil pore water sampling device, sulfide measuring device and soil pore water sulfide measuring method to which the present invention was applied, the sulfide concentration in the tidal flat was measured.
(1) Sampling device and sulfide measuring device The pore water sampler 1 described above was used as a soil pore water sampling device. In addition, for the measurement of sulfide concentration, a pack test (registered trademark) sulfide (Kyoritsu Chemical Laboratory Co., Ltd.), which is a sulfide measurement kit, was used. This sulfide measurement kit measures the sulfide concentration by colorimetry based on the concentration of methylene blue produced by reaction with sulfide by the methylene blue colorimetric method. The measurement was performed according to the method of using the kit. The measurement range of sulfide in the kit is 0.1 to 5.0 ppm. For samples containing sulfides with a high concentration exceeding this range, dilute the sample with oxygen-free water to measure the concentration. used.

(2) Test method Dividing a certain range of the tidal flat environment to be evaluated into six sites (A to F), sampling soil pore water at three locations within one site, and measuring the concentration of sulfide ions did. The measurement was performed four times at different times. Table 1 shows the measurement results of the sulfide ion concentration (ppm) at the three sites A to C, and Table 2 shows the measurement result of the sulfide ion concentration (ppm) at the three sites D to F. In addition, the part without the numerical value of Table 1 is not measured.

  As apparent from Tables 1 and 2, the concentration of sulfide ions in the range of 0.1 to 5.0 ppm could be measured at each of the six sites.

DESCRIPTION OF SYMBOLS 1 Pore water sampler 2 Filtration part 3 Tube part 4 Collecting part 5 Periphery 6 Adhesive 7 Filter paper 8 Substantially conical shape 9 Water bottom sludge 10 Soil pore water 11 Sample water 12 Container 13 Reaction reagent 14 Through-hole 15 Sample tube

Claims (7)

A substantially flat main body with one end sharp and formed with a space inside, and a filtration part configured to filter predetermined particles,
A tubular part having a through-hole and one end side inserted into the filtration part,
Adhering at least a part of the periphery of the filtration unit and the region in contact with the filtration unit of the tube unit, and a sealing unit that allows only moisture filtered by the filtration unit to pass through,
A soil pore water collection device comprising: a bag-like body positioned on the other end side of the tube portion, and a sample collection portion formed inside in communication with the through hole of the tube portion. The soil interstitial water collection device according to claim 1, wherein the sample collection unit is formed of a soft resin. The sampling apparatus for soil pore water according to claim 1 or 2, wherein the inside of the sample collection section and the tube section is filled with an inert gas. The soil pore water collection device according to claim 1, wherein the filtration unit is treated with a water repellent. The filtration part is formed to have an area of about 3 cm ² in plan view,
5. The soil pore water collection device according to claim 1, wherein the sample collection unit can store about 2 ml of moisture therein. It is a substantially flat main body, one end is sharp and formed with a space inside, a filtration part configured to filter predetermined particles, and a cylindrical body having a through hole, and one end side is the above-mentioned Adhering the tube part inserted into the inside of the filtration part and at least a part of the periphery of the filtration part and the region in contact with the filtration part of the tube part, only the water filtered by the filtration part is inside. A soil having a sealing portion that allows the material to pass through and a sample collection portion that is a bag-like body positioned on the other end side of the tube portion and that is formed so as to communicate with the through hole of the tube portion. Pore water collection device;
A sulfide measuring device for interstitial water, comprising a detection mechanism capable of measuring a sulfide concentration in water collected in the sample collection unit. It is a substantially flat main body, one end is sharp and formed with a space inside, a filtration part configured to filter predetermined particles, and a cylindrical body having a through hole, and one end side is the above-mentioned Adhering the tube part inserted into the inside of the filtration part and at least a part of the periphery of the filtration part and the region in contact with the filtration part of the tube part, only the water filtered by the filtration part is inside. A soil having a sealing portion that allows the material to pass through and a sample collection portion that is a bag-like body positioned on the other end side of the tube portion and that is formed so as to communicate with the through hole of the tube portion. Pore water collection device;
A device for measuring dissolved ions in soil interstitial water, comprising a detection mechanism capable of measuring dissolved ions of water collected in the sample collection unit.