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Ion chromatography detection method for simultaneous determination of sulfate radical and sulfite radical in desulfurized seawater

A technology of sulfate ions and sulfites, which is used in the field of chemical analysis to achieve the effect of preventing oxidation

Active Publication Date: 2017-12-15
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the basis of realizing simultaneous accurate quantification of sulfate ions and sulfite ions, the present invention proposes a new sample pretreatment method to remove the influence of calcium and magnesium ions on the test, and at the same time inhibit the oxidation of sulfite, which solves the existing problem Insufficient detection method

Method used

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  • Ion chromatography detection method for simultaneous determination of sulfate radical and sulfite radical in desulfurized seawater
  • Ion chromatography detection method for simultaneous determination of sulfate radical and sulfite radical in desulfurized seawater
  • Ion chromatography detection method for simultaneous determination of sulfate radical and sulfite radical in desulfurized seawater

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Embodiment 1

[0028] a. Draw a mixed standard curve of sulfate ion and sulfite ion, accurately weigh 1.5741g of anhydrous sodium sulfite and 1.4785g of anhydrous sodium sulfate superior pure reagent in the same beaker, use the mixed solution to dilute to a 1000ml volumetric flask, and prepare into a mixed standard stock solution; continue to use the mixed solution to dilute step by step to prepare sulfate and sulfite concentrations are 5.00mg / L, 10.00mg / L, 20.00mg / L, 50.00mg / L, 80.00mg / L, 100.00mg / L series mixed standard solution, under the condition that the instrument parameters are eluent 9mmol / L sodium carbonate solution, eluent flow rate 1.2mL / min, IonPacAS9-HC separation column working condition, use the anion in the standard solution configured The relationship between concentration C (mg / L) and ion chromatogram characteristic peak area A (μS·min) draws sulfate ion and sulfite ion test standard curves, see appendix figure 1 , figure 1 It shows that within the detected concentration ...

Embodiment 2

[0035] Precision, accuracy and recovery experiments of the detection method of the present invention.

[0036] The accuracy and precision of the method of the present invention are confirmed through standard recovery experiments and precision experiments of samples.

[0037] In the recovery experiment, after adding a certain amount of sulfate radical and sulfite ion standard solution in the Schleicher artificial seawater after desulfurization, according to the method of the present invention, the recovery rate of standard addition of the processed sample was detected, and the test results are shown in Table 2.

[0038] Table 2 Sulfate and sulfite ion precision and standard addition recovery experimental results (n=3)

[0039]

[0040]

[0041] Using this method to simultaneously quantitatively detect sulfate and sulfite ions in desulfurized seawater, the linearity is good in the concentration range of 5.00-100.00 mg / L, the correlation coefficient is above 0.999, and the ...

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Abstract

The invention provides an ion chromatography detection method for simultaneous determination of sulfate radical and sulfite radical in desulfurized seawater. The invention optimizes the chromatographic conditions, through the solution combination of formaldehyde, sodium hydroxide, and ethylenediamine tetraacetic acid disodium salt of specific concentration, sample pretreatment can be achieved, and specific ion chromatography detection parameters are regulated to achieve baseline separation of sulfite radical and sulfate radical, i.e. a new sample pretreatment method is put forward, on the basis of realizing simultaneous accurate quantification of sulfate ions and sulfite ions, the influence of calcium and magnesium ions on the test can be removed. The result shows that the sulfate radical detection limit is 0.04mg / L, and the sulfite radical detection limit is 0.03mg / L. The method has the characteristics of rapid detection, high sensitivity and good accuracy, is suitable for simultaneous quantitative detection of sulfate and sulfite ions in a seawater desulfurization system, and also is suitable for detection of sulfate and sulfite single ions in water with calcium and magnesium cations.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, in particular to a detection method for simultaneous determination of sulfate and sulfite in water containing calcium and magnesium ions, in particular to an ion chromatography detection method for simultaneous determination of sulfate and sulfite in desulfurized seawater method. Background technique [0002] Seawater flue gas desulfurization method is the preferred desulfurization method for coal-fired power plants in coastal areas. Sulfur in coal is converted into sulfur oxides after burning, and dissolves in seawater to form sulfate and sulfite. The solubility of calcium sulfite in water (wt%, 25°C) is 0.005g, the solubility of calcium sulfate (wt%, 25°C) is 0.2g, and the solubility of magnesium sulfite (wt%, 25°C) is 0.6g. Therefore, simultaneous and accurate quantification of trace amounts of sulfate and sulfite in desulfurized seawater can not only monitor the completeness of sea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 袁俊生孟宪泽张义田赵颖颖谢英惠孔令泉郭小甫李金才王士钊张之舵王军马振发李吉智
Owner HEBEI UNIV OF TECH
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