CN204807521U - A evaporating column and survey system for trace bromate survey - Google Patents
A evaporating column and survey system for trace bromate survey Download PDFInfo
- Publication number
- CN204807521U CN204807521U CN201520260333.8U CN201520260333U CN204807521U CN 204807521 U CN204807521 U CN 204807521U CN 201520260333 U CN201520260333 U CN 201520260333U CN 204807521 U CN204807521 U CN 204807521U
- Authority
- CN
- China
- Prior art keywords
- column
- hole
- evaporating
- bromate
- evaporating column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model provides an evaporating column of trace bromate survey, including the packed column, the packed column intussuseption is filled with anion exchange type resin adsorption material. The utility model also provides a survey system contains: for trace bromate survey an evaporating column, a guard column, an analytical column, a conductivity detector, get into the evaporating column when the sample, thereby the anion such as bromate that the evaporating column adsorbs in the sample on line make the anion enrichment on the evaporating column, the evaporating column is flowed through to the leachate makes anion such as bromate upwash from the evaporating column to take off, then it gets into the analytical column behind the guard column to flow through, the bromate is isolated to the analytical column, and detect through conductivity detector, wherein the evaporating column contains the packed column, it has anion exchange type adsorption material to fill in the packed column. Through adopting the evaporating column, combines the bulky appearance of advancing, realized the online enrichment of bromate, improved the system was surveyd to the bromate sensitivity and precision.
Description
Technical field
The utility model relates to the mensuration of trace amounts of bromine hydrochlorate, particularly relates to the efficient evaporating column and the Analytical system that measure trace amounts of bromine hydrochlorate.
Background technology
Along with the raising day by day of people's living standard, the safety and Health problem of potable water receives much attention already, and carcinogenic substance is wherein one of the focus be concerned about of people especially.Bromate (BrO
3 -) be bromide ion (Br in potable water
-) the important inorganic byproduct of one that produces after ozonization, be also that sodium hypochlorite is as product during thimerosal.1992, in the use safety examination report that the World Health Organization (WHO) (WHO) delivers, confirm that bromate is a kind of oxidisability carcinogenic substance, mainly can cause kidney and the bladder body generation canceration of animal.International cancer research institution (IARC) assert that bromate is 2B level potential carcinogen.Research shows, when to drink containing bromate be all the life the potable water of 5.0 μ g/L or 0.5 μ g/L to people, its carcinogenic danger degree is respectively 10
-4or 10
-5.
Many countries have been that the content of bromate sets limit value when formulating water quality standard.In Environmental Protection Agency (USEPA) drinking water standard, the maximum permissible concentration of regulation bromate is 10 μ g/L, and expectation value can't check.2004 the World Health Organization (WHO) (WHO) bromate limit value in " water quality standard for drinking water " is changed to 10 μ g/L from 25 μ g/L.National standard " natural mineral water " (GB8537-2008), " drinking water sanitary standard " (GB5749-2006) that China is existing, and the industry standard " urban water supply water quality standard " (CJ/T206-2005) that the Ministry of Construction promulgates, all the content of bromate is defined as 10 μ g/L.
Bromate is as DBPs, and the content in potable water is very low, is usually less than the μ g/L order of magnitude.Therefore, the assay method of research underwater trace and ultratrace bromate is significant, is also necessary.
In current mensuration water, the method for bromate mainly comprises vapor-phase chromatography, the chromatography of ions, spectrophotometric method etc.Wherein the chromatography of ions relies on simple to operate, without the need to a large amount of chemical reagent, has the advantage of higher sensitivity and accuracy, extremely the favor of analytical work person.The chromatography of ions has been classified as the standard method measuring bromate by USEPA.In ion chromatography water, the main detection means of bromate has Suppressor conductivity detection method, post-column derivation uv detection method, chromatography of ions-inductively coupled plasma mass spectrometry method (IC-ICP-MS) and chromatography of ions-electron spray mass spectrometry (IC-ESI-MS).
Suppressor conductivity detection method is simple to operate, environmental friendliness, but its sensitivity is slightly poor.The mode of usual employing large volume quantitative loop direct injected is to improve sensitivity.Sampling volume is many between 100-500 μ L, and detection limit scope is many between 0.2-5.0 μ g/L.At present, recommend in China's national standard method " the drinking water standard method of inspection " (GB/T5750-2006) to adopt bromate in water with ion chromatography, Suppressor conductivity detection, sampling volume 500 μ L, detection limit only has 5 μ g/L.
The higher method of sensitivity has post-column derivation ultraviolet method, inductively coupled plasma mass spectrometry (ICP-MS) and electron spray mass spectrometry (ESI-MS).The wherein more difficult control of the condition of post-column derivation, complex operation, and derivative reagent is mostly harmful; Strong with mass spectrometry antijamming capability, but instrument and running expense costliness, promote the use of and be subject to a definite limitation.
Day by day improve along with to the requirement of drinking water quality, make the detection limit adopting Suppressor conductivity detection method to measure at present be difficult to gradually meet mensuration requirement, urgent need precision is higher, the better Analytical system of stability.The evaporating column of the on-line preconcentration bromate that the utility model relates to and Analytical system, provide efficiently for measuring trace bromate, simple solution, highly sensitive, 0.01 μ g/L can be reached, improve at least one the order of magnitude than the sensitivity (0.1 ~ 5 μ g/L) of existing general analytical approach, effectively can solve the problem of current methods medium sensitivity deficiency.
Summary of the invention
The purpose of this utility model is the weak point existed for bromate Analytical system of the prior art, improves the Analytical system measured for trace amounts of bromine hydrochlorate.
According to the purpose of this utility model, the utility model provides a kind of evaporating column measured for trace amounts of bromine hydrochlorate, comprise packed column, it is characterized in that, anion exchange resin adsorption material is filled with in packed column, evaporating column also comprises two connecting portions being positioned at packed column two ends, and connecting portion has the hole communicated with packed column, so that liquid passes through to flow into or flows out packed column from hole.
Further, sorbing material is quaternised polystyrene-divinylbenzene cross-linked material.
The utility model additionally provides a kind of Analytical system measured for trace amounts of bromine hydrochlorate, comprise: an evaporating column, one guard column, one analytical column, one electric conductivity detector, when sample enters evaporating column, comprise the negative ion of bromate in evaporating column on-line adsorption sample thus make negative ion be enriched on evaporating column, leacheate flows through evaporating column makes negative ion elute from evaporating column, then analytical column is entered after flowing through guard column, analytical column isolates bromate, and detect through electric conductivity detector, it is characterized in that, evaporating column comprises packed column, anion exchange sorbing material is filled with in packed column.
Preferably, sorbing material is anion exchange resin adsorption material.
Further, sorbing material is quaternised polystyrene-divinylbenzene cross-linked material.
Preferably, evaporating column also comprises two connecting portions being positioned at packed column two ends, and connecting portion has the hole communicated with packed column, so that liquid passes through to flow into or flows out packed column from hole.
Further, Analytical system also comprises the injector that sample can be loaded to evaporating column by.Further, Analytical system also comprises a six-way valve, six-way valve have be arranged in order the first hole, the second hole, the 3rd hole, the 4th hole, the 5th hole and the 6th hole.
Further; be connected with the two ends of injector, evaporating column, guard column, leacheate and sewer pipe respectively by the first to the 6th hole of six-way valve; to control the connection order in six-way valve hole by switching six-way valve, realize that loading is concentrated respectively, removal waste fluid, drip washing, separation.
Further, the first hole is connected with injector, and the second hole is connected with the two ends of evaporating column respectively with the 5th hole, and the 3rd hole is connected with guard column, and the 4th hole is connected with leacheate, and the 6th hole is waste liquid outlet.
Further, injector is automatic sampler, comprises a sample introduction control loop, and sample introduction control loop inputs the sample of set amount according to microcomputer setting or artificial setup control injector in Analytical system.
The quantitative loop in existing determining instrument is substituted by employing evaporating column, in conjunction with large volume sample injection, realize online enrichment bromate, substantially increase Analytical system to the sensitivity of bromate and precision, easily can reach the order of magnitude of 0.1-0.01 μ g/L, compared with prior art, Analytical system is substantially increased to the Detection capability of trace level bromate and precision.Further, operation quantitative loop being changed into evaporating column is very simple, changes very little to existing determining instrument.And the evaporating column regeneration that the utility model adopts is convenient, can reuses, also greatly reduce cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the trace amounts of bromine hydrochlorate Analytical system of first-selected embodiment of the present utility model.
Fig. 2 is the diagrammatic cross-section of evaporating column structure in the Analytical system of first-selected embodiment of the present utility model.
Fig. 3 is the conventional sample introduction of bromate of first-selected embodiment of the present utility model and the chromatography of ions comparison diagram of concentrated sample introduction.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further detailed and sets forth.
As shown in Figure 1, the trace amounts of bromine hydrochlorate Analytical system of first-selected embodiment of the present utility model comprises injector 10, evaporating column 12, guard column 14, analytical column 16, electric conductivity detector 18.
Sample solution is injected into evaporating column 12 by injector 10, and sample comprises bromate and is enriched on evaporating column 12 at interior negative ion.Adopt the online generator of leacheate; generate highly purified potassium hydroxide leacheate, leacheate flows through evaporating column 12 and is eluted from evaporating column 12 by the negative ion comprising bromate of enrichment, flows through guard column 14; after being separated by analytical column 16, electric conductivity detector 18 detects.Appearance time is qualitative, and peak area quantification obtains the concentration of bromate.
In first-selected embodiment, after wash-out, first liquid flow through guard column, after pollutant is wherein trapped, then flows into analytical column and carry out Anion separation.In this way, to reduce in sample pollutant to the damage of analytical column as far as possible, with improve analytical column serviceable life, stablize its separating effect.And guard column is as easily-consumed products, can regularly replace.
In this first-selected embodiment, injector 10 is automatic sampler, has a sample feeding controller, is a sample introduction control loop first-selectedly, is connected, is set by computer program with computer, can control the amount of each loading of injector 10, such as each 5ml.In other embodiments, also by the other forms of microprocessor except computer or manually can set, or inject by artificial the amount controlling each loading.The amount of each loading is relevant to detection limit (in certain limit, applied sample amount is larger, and detection limit is lower), therefore also according to the measurement environment of reality and can measure requirement, set corresponding applied sample amount.In other embodiments, for Analytical system, injector can not be the part that Analytical system carries, but the accessory that can configure in addition.
As shown in Figure 2, evaporating column 12 comprises packed column 122, and lays respectively at the connecting portion 124,126 at packed column 122 two ends.Connecting portion 124,126 has a hole respectively, passes therethrough to flow into or flow out evaporating column 12 to allow sample.Anion exchange sorbing material is filled with, particularly anion exchange resin adsorption material, such as quaternised polystyrene-divinylbenzene cross-linked material in packed column 122.Sorbing material is graininess, and particle diameter is roughly 11 μm.The first-selected internal diameter of size of packed column is 4mm, and length is 50mm.In other embodiments, sorbing material and packed column also can possess other shapes, size.
First-selected ground; injector 10, evaporating column 12, guard column 14 is connected by a six-way valve 20; liquid discharge entrance, waste fluid channel and leacheate passage are provided for it; by controlling the switching of six-way valve 20 rotor and stator relative position; form different liquid flow paths, thus control the approach of liquid stream warp.Six-way valve 20 has six holes, and what definition was connected with injector is the first hole, and six holes of six-way valve 20 respectively are the first hole 202, hole 201, second, the 3rd hole 203, the 4th hole 204, the 5th hole 205, the 6th hole 206.In first-selected embodiment; first hole 201 is connected with injector 10, and the second hole 202, the 5th hole 205 are connected with the two ends of evaporating column 12 respectively, and the 3rd hole 203 is connected with guard column 14; 4th hole 204 is leacheate entrance, and the 6th hole 206 is the waste liquid outlet of evaporating column 12.
As shown in Figure 1, for six-way valve part, solid line is the stream of loading (Load) state, and dotted line is the stream of sample introduction (Inject) state.
Loading (Load) state: six-way valve is placed in loading state, injector 10 is by sample solution, be pressed into by the first hole 201, flow out from the second hole 202, a link 124 through evaporating column 12 flows into evaporating column 12, negative ion in sample solution, comprise bromate and other matrix ions, be concentrated the sorbing material displacement sorption in post 12, be retained on evaporating column 12, realize the enrichment of bromate on evaporating column 12, and the waste liquid of sample solution after enrichment is from another link 126 to the five hole 205 of evaporating column, flow out through the 6th hole 206.Loading (Load) stream of sample is: the first hole 202, hole 201, second of injector 10, six-way valve, evaporating column 12, the 5th hole 205, the 6th hole 206, waste fluid container.Under this state of six-way valve, the stream of leacheate is: the 4th hole 204 of leacheate generator, six-way valve, the 3rd hole 203, guard column 14, analytical column 16, electric conductivity detector 18.
Sample introduction (Inject) state: after all (such as: 5mL) is pressed into evaporating column when testing sample solution; six-way valve switches to sample introduction (Inject) state; leacheate and evaporating column 12 are connected; and gradient increases the ionic strength of leacheate; the negative ion comprising bromate of enrichment on evaporating column 12 is eluted; after flowing through guard column 14, enter analytical column 16 and isolate bromate, then detected by electric conductivity detector 18.Stream is now: the 4th hole 204 of leacheate generator, six-way valve, the 5th hole 205, evaporating column 12, second hole 202, the 3rd hole 203, guard column 14, analytical column 16, electric conductivity detector 18.
Experiment one:
In order to verify the effect of evaporating column, be analyzed by the following method:
(1) compound concentration is the bromate solution of 5.12 μ g/L;
(2) conventional sample introduction 25 μ L, does not use evaporating column to carry out enrichment to bromate ion, the quantitative loop volume usually adopted when wherein 25 μ L are existing detecting instrument sample introduction, detects and calculates the bromate peak area of non-concentrated sample introduction;
(3) sample introduction 5mL, by evaporating column on-line preconcentration bromate ion;
(4) detect and calculate the peak area concentrating rear bromate;
(5) (2), (3), (4) step are repeated 2 times again, comprehensive 3 measurement results, there were significant differences for the bromate peak area of concentrated mensuration, concentrated rear mensuration, and show that the enrichment factor of evaporating column is about 240 times as calculated, as shown in Figure 3 be comparing of the chromatography of ions figure of the conventional sample introduction (that is: non-concentrated sample introduction) (as shown in A in Fig. 3) of bromate and concentrated sample introduction (as shown in B in Fig. 3) in this experiment, arrow points is the chromatography of ions peak of bromate.
Empirical tests, the concentrated effect of evaporating column to bromate is remarkable.Certainly, enrichment factor also can change because of the difference of sample size size, but relative to conventional sample introduction, due to the existence of evaporating column, make sample size rise to ml rank from μ L rank, the amount of the bromate that such electric conductivity detector detects increases with decades of times or hundreds of times, thus greatly reduces the detection limit of bromate, the rank of 0.1-0.01 μ g/L can be reached relatively easily, drastically increase sensitivity.
Experiment two:
For measuring the range of linearity of the utility model Analytical system, draw calibration curve by the following method:
(1) prepare the bromate standard solution of variable concentrations, concentration range is between 0.05-51.2 μ g/L;
(2) this Analytical system is adopted, respectively to the bromate standard solution sample introduction 5ml of variable concentrations;
(3) detect and calculate testing result;
(4) statistics, obtains conclusion: the linear relationship of bromate concentration between 0.05-51.2 μ g/L is good, and the range of linearity is at least 3 orders of magnitude, related coefficient >=0.9995.
Experiment three:
In order to verify the detection limit of the utility model Analytical system, carry out by the following method measuring and analyzing:
(1) prepare the bromate standard solution of 7 part of 0.05 μ g/L, empirically the step analysis of two measures;
(2) according to HJ168-2010 regulation, the standard deviation S of 7 replicate determinations is calculated, by method detection limit computing formula
MDL＝3.143×S，
Obtain when sample size is 5ml, the detection limit of the utility model Analytical system, the least concentration that can detect is 0.01 μ g/L.As previously mentioned, enrichment factor can change because sample size change, therefore can when concrete mensuration detection limit as required, suitable adjustment sample size.
It is more than the qualification to the Analytical system that the utility model measures for trace amounts of bromine hydrochlorate.
When needs adopt Analytical system of the present utility model to carry out bromate concentration mensuration to testing sample, following steps are adopted to measure:
(1) first adopt method and the step of experiment two, calibrate Analytical system, if the linear relationship of calibration result is good, then mean that Analytical system duty is good, calibration curve can be used;
And then adopt Analytical system of the present utility model to carry out loading (Load), concentrated, wash-out sample introduction (Inject), separations, detection to testing sample, and calculate the bromate concentration of testing sample (2).
Experiment four:
Adopt Analytical system of the present utility model to carry out analysis to commercially available A, B, C tri-kinds of pure water to detect, and carry out recovery of standard addition mensuration, result is as shown in table 1.Data result shows, this assay method accuracy can meet analysis requirement.
Table 1: the bromate of three kinds of commercially available pure water measures
Above content provide only preferred implementation of the present utility model.Those skilled in the art can be easy to expect according to text description provided by the utility model, accompanying drawing and claims, under the condition not departing from design of the present utility model that claims limit and scope, multiple apparent change can be made, substitute and amendment.Protection domain of the present utility model is determined by claim.
Claims (15)
1. the evaporating column measured for trace amounts of bromine hydrochlorate, comprise packed column, it is characterized in that, anion exchange resin adsorption material is filled with in described packed column, described evaporating column also comprises two connecting portions being positioned at packed column two ends, described connecting portion has the hole communicated with described packed column, so that liquid passes through to flow into or flows out packed column from described hole.
2., as claimed in claim 1 for the evaporating column that trace amounts of bromine hydrochlorate measures, it is characterized in that, described sorbing material is quaternised polystyrene-divinylbenzene cross-linked material.
3., as claimed in claim 1 for the evaporating column that trace amounts of bromine hydrochlorate measures, it is characterized in that, described sorbing material is graininess, and particle diameter is 11 μm.
4., as claimed in claim 1 for the evaporating column that trace amounts of bromine hydrochlorate measures, it is characterized in that, the internal diameter of described packed column is 4mm, and length is 50mm.
5. as claimed in claim 1 for the evaporating column that trace amounts of bromine hydrochlorate measures, it is characterized in that, on the six-way valve that described evaporating column can be connected directly between a bromate Analytical system thus on-line preconcentration bromate.
6. the Analytical system measured for trace amounts of bromine hydrochlorate, comprise: an evaporating column, one guard column, one analytical column, one electric conductivity detector, when sample enters described evaporating column, comprise the negative ion of bromate in sample described in described evaporating column on-line adsorption thus make negative ion on-line preconcentration on described evaporating column, leacheate flows through described evaporating column makes described negative ion elute from described evaporating column, then described analytical column is entered after flowing through described guard column, described analytical column isolates bromate, and detect through described electric conductivity detector, it is characterized in that, described evaporating column comprises packed column, anion exchange sorbing material is filled with in described packed column.
7. as claimed in claim 6 for the Analytical system that trace amounts of bromine hydrochlorate measures, it is characterized in that, the sorbing material of filling in described evaporating column is anion exchange resin adsorption material.
8. as claimed in claim 6 for the Analytical system that trace amounts of bromine hydrochlorate measures, it is characterized in that, the sorbing material of filling in described evaporating column is quaternised polystyrene-divinylbenzene cross-linked material.
9. as claimed in claim 6 for the Analytical system of trace amounts of bromine hydrochlorate mensuration, it is characterized in that, described evaporating column also comprises two connecting portions being positioned at packed column two ends, described connecting portion has the hole communicated with described packed column, so that liquid passes through to flow into or flow out described packed column from described hole.
10., as claimed in claim 6 for the Analytical system that trace amounts of bromine hydrochlorate measures, it is characterized in that, the internal diameter of described packed column is 4mm, and length is 50mm.
11. as claimed in claim 6 for the Analytical system that trace amounts of bromine hydrochlorate measures, and it is characterized in that, described sorbing material is graininess, and particle diameter is 11 μm.
12. as claimed in claim 6 for the Analytical system that trace amounts of bromine hydrochlorate measures, and it is characterized in that, described Analytical system also comprises the injector that described sample can be loaded to described evaporating column by.
13. as claimed in claim 12 for the Analytical system of trace amounts of bromine hydrochlorate mensuration, it is characterized in that, described Analytical system also comprises a six-way valve, described six-way valve have be arranged in order the first hole, the second hole, the 3rd hole, the 4th hole, the 5th hole and the 6th hole.
14. as claimed in claim 13 for the Analytical system of trace amounts of bromine hydrochlorate mensuration; it is characterized in that; be connected with the two ends of described injector, described evaporating column, described guard column, described leacheate and sewer pipe respectively by the first to the 6th hole of described six-way valve; to control the connection order in described six-way valve hole by switching six-way valve, realize large volume loading, online concentrated, removal waste fluid, drip washing, separation respectively.
15. as claimed in claim 13 for the Analytical system of trace amounts of bromine hydrochlorate mensuration; it is characterized in that; described first hole is connected with described injector; described second hole is connected with the two ends of described evaporating column respectively with the 5th hole; described 3rd hole is connected with described guard column; described 4th hole is connected with described leacheate, and described 6th hole is waste liquid outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520260333.8U CN204807521U (en) | 2015-04-23 | 2015-04-23 | A evaporating column and survey system for trace bromate survey |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520260333.8U CN204807521U (en) | 2015-04-23 | 2015-04-23 | A evaporating column and survey system for trace bromate survey |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204807521U true CN204807521U (en) | 2015-11-25 |
Family
ID=54592326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520260333.8U Active CN204807521U (en) | 2015-04-23 | 2015-04-23 | A evaporating column and survey system for trace bromate survey |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204807521U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153789A (en) * | 2015-04-23 | 2016-11-23 | 刘晶 | The evaporating column measured for trace amounts of bromine hydrochlorate and the system of mensuration |
-
2015
- 2015-04-23 CN CN201520260333.8U patent/CN204807521U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106153789A (en) * | 2015-04-23 | 2016-11-23 | 刘晶 | The evaporating column measured for trace amounts of bromine hydrochlorate and the system of mensuration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hamilton | Ion exchange chromatography of amino acids. A single column, high resolving, fully automatic procedure. | |
| Balinova | Solid-phase extraction followed by high-performance liquid chromatographic analysis for monitoring herbicides in drinking water | |
| Mai et al. | Capillary electrophoresis with contactless conductivity detection coupled to a sequential injection analysis manifold for extended automated monitoring applications | |
| Magnuson et al. | Speciation of arsenic compounds by ion chromatography with inductively coupled plasma mass spectrometry detection utilizing hydride generation with a membrane separator | |
| CN102749412B (en) | Ion chromatography and voltammetric detection method for quickly determining anions in milk | |
| CN103837530A (en) | Simultaneous online analysis method for nitrite and nitrate in water sample and test sample treatment device thereof | |
| US6526811B2 (en) | Analytical apparatus for measurement of low concentration constituent, method of measurement and calibration using the same | |
| CN102507765A (en) | Method for simultaneously detecting content of trace bromate and nitrite in drinking water | |
| Smee et al. | Analysis of fluoride, chloride, nitrate and sulphate in natural waters using ion chromatography | |
| Horstkotte et al. | Sequential injection chromatography with post-column reaction/derivatization for the determination of transition metal cations in natural water samples | |
| CN204807521U (en) | A evaporating column and survey system for trace bromate survey | |
| Smith Jr et al. | Ion chromatography | |
| US11226274B2 (en) | Method of analyzing using analyte concentrator system having eluent generation module | |
| CN201527389U (en) | Detection device of performance of preventing infiltration of chemicals for relief protective clothing materials | |
| Romano et al. | Regulated methods for ion analysis | |
| CN105675594A (en) | Working fluid for detection of chlorine ions in water vapor in power plant and detection method and use | |
| Kumar et al. | Determination of chloride in nuclear-grade boron carbide by ion chromatography | |
| CN104569214A (en) | Method for measuring low-concentration p-xylene in metal ion and organism composite wastewater | |
| CN106153789A (en) | The evaporating column measured for trace amounts of bromine hydrochlorate and the system of mensuration | |
| CN204789499U (en) | One way autoinjection gas chromatograph | |
| CN102967574A (en) | Method for fast enriching and detecting trace amount of As (V) and Cr (VI) contained in water by filling microcolumn by utilizing fiber | |
| CN202057584U (en) | Structure for restraining resolvable gas by using glycolated hemoglobin analysis meter and photometer | |
| CN102495159A (en) | Ion chromatography-valve switching analysis system for simultaneously detecting iodide ions and iodate ions | |
| CN114324635B (en) | Method for measuring bromate in drinking water by utilizing ion chromatography on-line matrix elimination system | |
| CN218726954U (en) | Low-concentration organic amine detection device containing concentration device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |