CN113484443A - Method for testing content of impurity cations in ammonia water reagent for power plant feed water treatment - Google Patents
Method for testing content of impurity cations in ammonia water reagent for power plant feed water treatment Download PDFInfo
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- CN113484443A CN113484443A CN202110853099.XA CN202110853099A CN113484443A CN 113484443 A CN113484443 A CN 113484443A CN 202110853099 A CN202110853099 A CN 202110853099A CN 113484443 A CN113484443 A CN 113484443A
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 150000001768 cations Chemical class 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003153 chemical reaction reagent Substances 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 239000012535 impurity Substances 0.000 title claims abstract description 17
- 239000011550 stock solution Substances 0.000 claims abstract description 31
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 24
- 239000012224 working solution Substances 0.000 claims abstract description 23
- 150000002500 ions Chemical class 0.000 claims abstract description 20
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 19
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 17
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001414 potassium ion Inorganic materials 0.000 claims abstract description 13
- 239000012086 standard solution Substances 0.000 claims abstract description 12
- 238000007865 diluting Methods 0.000 claims abstract description 9
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 37
- 238000001704 evaporation Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000011410 subtraction method Methods 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 16
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 229940098779 methanesulfonic acid Drugs 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 238000002835 absorbance Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- -1 Na)+ Chemical class 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000001724 coherent Stokes Raman spectroscopy Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000012488 sample solution Substances 0.000 description 2
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/86—Signal analysis
- G01N30/8624—Detection of slopes or peaks; baseline correction
- G01N30/8641—Baseline
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N2030/042—Standards
- G01N2030/047—Standards external
Abstract
The invention discloses a method for testing the content of impurity cations in an ammonia water reagent for power plant feed water treatment, which comprises the following steps: weighing an ammonia water sample, and preparing ammonia water to be detected by using the ammonia water sample; debugging the ion chromatograph; setting working conditions; mixing sodium ion standard stock solution, magnesium ion standard stock solution, potassium ion standard stock solution and calcium ion standard stock solution, diluting and fixing the volume to obtain intermediate mixed standard solution; preparing N groups of mixed standard working solutions with different concentrations; analyzing each group of mixed standard working solutions with different concentrations by using an ion chromatograph, recording the peak emergence time on a spectrogram corresponding to the mixed standard working solution, and then drawing a standard working curve by taking the peak area or peak height as a vertical coordinate and the concentration as a horizontal coordinate; the method can accurately and quickly determine the content of each cation in the ammonia water reagent.
Description
Technical Field
The invention relates to a test method, in particular to a test method for the content of impurity cations in an ammonia water reagent for power plant feed water treatment.
Background
The mode of adding ammonia into the feed water is usually adopted for corrosion prevention of the thermal power plant thermodynamic system, so that the pH value of the feed water is increased in a proper alkaline range, the corrosion speed of metal materials in the feed water system is controlled, acidic corrosion caused by free carbon dioxide is prevented, corrosion products of the feed water and boiler water are reduced, and the steam-water quality qualification rate of a unit is ensured.
However, ammonia contains excessive cations (mainly Na)+、K+、Mg2+、Ca2+) In the process, the impurities enter the furnace along with the pH regulation process, so that the quality of water vapor in the furnace is directly influenced, and serious accidents such as salt accumulation, scaling, tube explosion and the like of thermal equipment are caused after long-term circulating operation.
The current test method is GB/T631 and 2007 chemical reagent ammonia water. The specific operation method for measuring the content of the cations in the ammonia water comprises the following steps: a certain amount of sample is weighed and dried by distillation on a water bath, and the residue is dissolved by hydrochloric acid solution and a proper amount of water and diluted. Preparing a sample solution, a blank experiment solution and 4-5 Na with mass concentration in proportion according to the regulation of GB/T9723-2007 general rules of chemical reagent flame absorption Spectroscopy+、K+、Mg2+、Ca2And (4) standard solution. The absorbance was measured under the conditions of the atomic absorption spectrometer by adjusting the absorbance to zero with water. And drawing a standard working curve by taking the mass concentration and the corresponding absorbance of the standard solution as a horizontal coordinate and a vertical coordinate respectively. And (5) checking the mass concentration of the element to be detected in the sample solution by means of the standard working curve. Each element was individually analyzed by flame atomic absorption using a corresponding hollow cathode lamp, and a standard work piece was drawn according to the above method.
The standard working curves are drawn respectively in the different cation content measuring processes, instrument testing conditions are changed one by one, the whole process is large in test operation amount, long in consumed time, complex in data processing, low in working efficiency, and prone to operational problems affecting the accuracy of test data.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for testing the content of impurity cations in an ammonia water reagent for power plant feed water treatment, which can accurately and quickly test the content of each cation in the ammonia water reagent.
In order to achieve the aim, the method for testing the content of the impurity cations in the ammonia water reagent for the feed water treatment of the power plant comprises the following steps:
1) weighing an ammonia water sample, and preparing ammonia water to be detected by using the ammonia water sample;
2) debugging an ion chromatograph
3) Setting working conditions;
4) preparing sodium ion standard storage solution, magnesium ion standard storage solution, potassium ion standard storage solution and calcium ion standard storage solution;
5) mixing sodium ion standard stock solution, magnesium ion standard stock solution, potassium ion standard stock solution and calcium ion standard stock solution, diluting and fixing the volume to obtain intermediate mixed standard solution;
6) dividing the intermediate mixed standard solution into N groups, and then diluting with water to a constant volume to obtain N groups of mixed standard working solutions with different concentrations;
7) analyzing each group of mixed standard working solution with different concentrations by using an ion chromatograph, recording the peak emergence time on a spectrogram corresponding to the mixed standard working solution, determining the retention time of each ion in the standard working solution, and then drawing a standard working curve by taking the peak area or peak height as a vertical coordinate and the concentration as a horizontal coordinate;
8) and measuring the peak height or peak area of each cation in the ammonia water to be measured, and determining the cation content in the ammonia water to be measured according to the standard working curve.
The specific operation process of the step 1) is as follows:
and weighing an ammonia water sample by using a subtraction method, putting the ammonia water sample into a beaker, putting the beaker into a ventilation kitchen for evaporation and concentration, and transferring the ammonia water sample into a volumetric flask to be detected by using high-purity water to obtain the ammonia water to be detected.
Adjusting the debugging water of the ion chromatograph in the step 2) into deionized water with the resistivity of 18.3M omega cm.
N is equal to 5.
In the step 6), the concentrations of the sodium ion standard stock solutions in the mixed standard working solutions are different.
Step 7) also includes: and constructing a regression equation corresponding to the standard working curve.
The volume of the magnesium ion standard storage solution, the volume of the potassium ion standard storage solution and the volume of the calcium ion standard storage solution are respectively 1 time, 2 times and 2 times of the volume of the sodium ion standard storage solution.
The concentrations of the standard sodium ion stock solutions in the five groups of mixed standard working solutions are 0.25mg/L, 0.5mg/L, 1.0mg/L, 1.5mg/L and 2.0mg/L respectively.
The invention has the following beneficial effects:
the method for testing the content of the impurity cations in the ammonia water reagent for the feed water treatment of the power plant comprises the steps of preparing mixed standard working solutions with different concentrations by using a sodium ion standard storage solution, a magnesium ion standard storage solution, a potassium ion standard storage solution and a calcium ion standard storage solution, drawing a standard working curve by using an ion chromatography technology, and finally determining the content of the cations in the ammonia water to be tested.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following embodiments of the present invention will be clearly and completely described in the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the disclosure of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for testing the content of the impurity cations in the ammonia water reagent for the feed water treatment of the power plant comprises the following steps of:
1) weighing an ammonia water sample by using a subtraction method, putting the ammonia water sample into a beaker, putting the beaker into a ventilation kitchen for evaporation and concentration, wherein the ammonia water sample cannot be boiled and splashed out in the evaporation process, concentrating the ammonia water sample to 5mL for cooling, and transferring the ammonia water sample to a 100mL volumetric flask for testing by using high-purity water to obtain ammonia water to be tested;
2) debugging an ion chromatograph, wherein the water for debugging the ion chromatograph is deionized water with the resistivity of 18.3M omega cm;
3) setting working conditions;
4) preparing sodium ion standard storage solution, magnesium ion standard storage solution, potassium ion standard storage solution and calcium ion standard storage solution;
5) mixing sodium ion standard stock solution, magnesium ion standard stock solution, potassium ion standard stock solution and calcium ion standard stock solution, diluting and fixing the volume to obtain intermediate mixed standard solution;
6) dividing the intermediate mixed standard solution into N groups, and then diluting with water to a constant volume to obtain N groups of mixed standard working solutions with different sodium ion standard stock solution concentrations;
7) analyzing the mixed standard working solution with different sodium ion standard stock solution concentrations in each group by using an ion chromatograph, recording the peak emergence time on a spectrogram corresponding to the mixed standard working solution, determining the retention time of each ion in the standard working solution, drawing a standard working curve by taking the peak area as a vertical coordinate and the concentration as a horizontal coordinate, and constructing a regression equation corresponding to the standard working curve;
8) and measuring the peak height or peak area of each cation in the ammonia water to be measured, and determining the cation content in the ammonia water to be measured according to the standard working curve.
The working conditions set in the step 3) are as follows: cation analysis column: IonPac CS12A, CG12A, 2 mm; methane sulfonic acid eluent: washing at equal degree (0-20 min, 18mmol/L MSA); a suppressor: CSRS 2mm, auto-suppression mode; flow rate: 0.30 mL/min; sample introduction amount: 25 μ L.
The volume of the magnesium ion standard storage solution, the volume of the potassium ion standard storage solution and the volume of the calcium ion standard storage solution are respectively 1 time, 2 times and 2 times of the volume of the sodium ion standard storage solution.
Example one
The specific process of this embodiment is as follows:
1) weighing 20g of ammonia water sample by using a subtraction method, placing the ammonia water sample in a beaker, then evaporating and concentrating in a ventilated kitchen, wherein the ammonia water sample cannot be boiled and splashed out in the evaporation process, concentrating to 5mL, cooling, and transferring to a 100mL volumetric flask by using high-purity water;
2) and (3) debugging the ion chromatograph, wherein the debugging water is deionized water with the resistivity of 18.3M omega cm.
3) Setting working conditions, wherein the cation analysis column: IonPac CS12A, CG12A, 2 mm; methane sulfonic acid eluent: leaching at equal degree: 0-20 min, 18mmol/L MSA; a suppressor: CSRS 2mm, auto-suppression mode; flow rate: 0.30 mL/min; sample introduction amount: 25 μ L.
4) Preparing a standard stock solution;
standard stock solution of sodium ion (as Na)+Counting: 1000 mg/L): 2.542g of sodium chloride was weighed out and dissolved to a constant volume of 1L.
Magnesium ion standard stock solution (as Mg)2+Counting: 1000 mg/L): 1.657g of magnesium oxide was weighed, moistened with water, dissolved in hydrochloric acid and then added in an excess of 2.5mL, and finally the volume was made 1L with water.
Standard stock solution of potassium ion (in K)+Counting: 1000 mg/L): 1.907g of potassium chloride is weighed and dissolved to a constant volume of 1L.
Standard stock solution of calcium ion (as Ca)2+Counting: 1000 mg/L): 2.497g of calcium carbonate are weighed, moistened with water, dissolved in hydrochloric acid and then overdosed by 2.5mL, and finally the volume is adjusted to 1L by water.
5) Preparing an intermediate mixed standard solution;
transferring 5mL of sodium ion standard storage solution, 5mL of magnesium ion standard storage solution, 10mL of potassium ion standard storage solution and 10mL of calcium ion standard storage solution, mixing, diluting with water to constant volume, and preparing into an intermediate mixed standard solution with the concentration of the sodium ion standard storage solution being 50 mg/L;
6) preparing a mixed standard working solution;
dividing the intermediate mixed standard solution into 5 groups, and diluting with water to constant volume respectively to obtain five groups of mixed standard working solutions, wherein the concentrations of the sodium ion standard storage solution in the five groups of mixed standard working solutions are 0.25mg/L, 0.5mg/L, 1.0mg/L, 1.5mg/L and 2.0mg/L respectively.
7) Analyzing each group of mixed standard working solution by using an ion chromatograph, recording the peak-out time on a map, determining the retention time of each ion, then drawing a standard working curve by taking the peak area or peak height as a vertical coordinate and the concentration of the sodium ion standard storage solution as a horizontal coordinate, and solving a regression equation of the standard working curve;
8) and (4) analyzing and measuring the ammonia water to be measured by using an ion chromatograph, and determining the concentration of the cations according to the peak height or peak area of the cations in the ammonia water to be measured and the standard working curve.
The present invention binds to cation Na+、K+、Mg2+、Ca2+The type characteristics of the method are that ammonia water is pretreated by adopting an evaporation concentration method, the obtained concentrated solution is diluted to constant volume, a methane sulfonic acid leacheate brings a reagent solution into an analytical column, and Na is detected according to detected cations+、K+、Mg2+、Ca2+The separation is realized by different retention characteristics on the analytical column, when the methane sulfonic acid leacheate carries reagent solution to pass through the inhibitor, each anion is exchanged into hydrogen ions, the methane sulfonic acid leacheate is converted into water, and the conductivity is reduced; at the same time, the cation Na is detected+、K+、Mg2+、Ca2Converted into corresponding alkali, the conductivity is increased, a response signal is detected by a conductivity detector, a data processing system records and displays an ion chromatogram map, and the retention time is taken as detected cation Na+、K+、Mg2+、Ca2+And the method is qualitative, and quantifies the ion content by peak height or peak area, so that the corresponding ion content is obtained, and the method has the characteristics of good reproducibility, high accuracy and high working efficiency.
Claims (8)
1. A method for testing the content of impurity cations in an ammonia water reagent for power plant feed water treatment is characterized by comprising the following steps:
1) weighing an ammonia water sample, and preparing ammonia water to be detected by using the ammonia water sample;
2) debugging an ion chromatograph
3) Setting working conditions;
4) preparing sodium ion standard storage solution, magnesium ion standard storage solution, potassium ion standard storage solution and calcium ion standard storage solution;
5) mixing sodium ion standard stock solution, magnesium ion standard stock solution, potassium ion standard stock solution and calcium ion standard stock solution, diluting and fixing the volume to obtain intermediate mixed standard solution;
6) dividing the intermediate mixed standard solution into N groups, and then diluting with water to a constant volume to obtain N groups of mixed standard working solutions with different concentrations;
7) analyzing each group of mixed standard working solutions with different concentrations by using an ion chromatograph, recording the peak emergence time on a spectrogram corresponding to the mixed standard working solution, and then drawing a standard working curve by taking the peak area or peak height as a vertical coordinate and the concentration as a horizontal coordinate;
8) and measuring the peak height or peak area of each cation in the ammonia water to be measured, and determining the cation content in the ammonia water to be measured according to the standard working curve.
2. The method for testing the content of the impurity cations in the ammonia water reagent for the feed water treatment of the power plant according to claim 1, wherein the specific operation process of the step 1) is as follows:
and weighing an ammonia water sample by using a subtraction method, putting the ammonia water sample into a beaker, putting the beaker into a ventilation kitchen for evaporation and concentration, and transferring the ammonia water sample into a volumetric flask to be detected by using high-purity water to obtain the ammonia water to be detected.
3. The method for testing the content of the impurity cations in the ammonia water reagent for power plant feed water treatment according to claim 1, wherein the water used for debugging the ion chromatograph in the step 2) is deionized water with the resistivity of 18.3M Ω -cm.
4. The method for testing the content of impurity cations in an ammonia reagent for power plant feedwater treatment of claim 1, wherein N is equal to 5.
5. The method for testing the content of the impurity cations in the ammonia water reagent for power plant feed water treatment as claimed in claim 1, wherein in the step 6), the concentrations of the sodium ion standard stock solutions in the mixed standard working solutions in each group are different.
6. The method for testing the content of the impurity cations in the ammonia water reagent for the feed water treatment of the power plant as claimed in claim 1, wherein the step 7) further comprises the following steps: and constructing a regression equation corresponding to the standard working curve.
7. The method for testing the content of the impurity cations in the ammonia water reagent for power plant feed water treatment according to claim 1, wherein the volume of the magnesium ion standard stock solution, the volume of the potassium ion standard stock solution and the volume of the calcium ion standard stock solution are respectively 1 time, 2 times and 2 times of the volume of the sodium ion standard stock solution.
8. The method for testing the content of the impurity cations in the ammonia water reagent for the power plant feed water treatment as claimed in claim 1, wherein the concentrations of the standard sodium ion stock solutions in the five groups of mixed standard working solutions are 0.25mg/L, 0.5mg/L, 1.0mg/L, 1.5mg/L and 2.0mg/L respectively.
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| 郑玉兰: "用离子色谱法测定固体废物浸出液中的阴阳离子", 《环境保护科学》 * |
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