Method for measuring concentration of total-iron ion in chemical cleaning solution containing strong complex

A technology of iron ion concentration and chemical cleaning, which is applied in the direction of chemical analysis by titration method, can solve the problems of poor accuracy, time-consuming, cumbersome determination methods, etc., and achieve the effect of high sensitivity and accuracy, and simple operation

Inactive Publication Date: 2019-01-11
XIAN THERMAL POWER RES INST CO LTD +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for determining the concentration of total iron ions in a chemical cleaning solution containing strong complexes, so as to solve the problems of cumbersome, time-consuming and poor accuracy in the existing measurement methods. The present invention is based on the con...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Prepare a simulated chemical cleaning solution containing strong complexes: 1000mL of 10% citric acid + 2% EDTA + 1.0% glycolic acid mixed solution, add an appropriate amount of FeSO 4 ·7H 2 O to make the total iron content in the solution 1000mg / L, dissolve and react in a water bath at 90°C and cool to room temperature. Contain the assay method of total iron ion concentration in a kind of strong complex chemical cleaning solution of the present invention and measure the total iron content wherein, concrete steps are as follows:

[0022] Step 1: After the chemical cleaning solution containing strong complexes is filtered through rapid qualitative filter paper, draw 2 mL with a quantitative pipette and place it in a conical flask for titration.

[0023] The second step: add 2mL of sulfuric acid-silver sulfate (H 2 SO 4 -Ag 2 SO 4 ) solution, then add 25mL ammonium persulfate [(NH 4 ) 2 S 2 o 8 ] solution.

[0024] Step 3: Put the Erlenmeyer flask on the electri...

Embodiment 2

[0031] Prepare a simulated chemical cleaning solution containing strong complexes: 6% EDTA + 2% HEDTA + 2.0% DPTA mixed solution 1000mL, add appropriate amount of FeSO 4 ·7H 2 O to make the total iron content in the solution 8000mg / L, dissolve and react in a water bath at 90°C and cool to room temperature. Contain the assay method of total iron ion concentration in a kind of strong complexing substance chemical cleaning liquid of the present invention and measure the total iron ion content wherein, concrete steps are as follows:

[0032] Step 1: After the chemical cleaning solution containing strong complexes is filtered through rapid qualitative filter paper, draw 2 mL with a quantitative pipette and place it in a conical flask for titration.

[0033] The second step: add 2mL of sulfuric acid-silver sulfate (H 2 SO 4 -Ag 2 SO 4 ) solution, then add 30mL ammonium persulfate [(NH 4 ) 2 S 2 o 8 ] solution.

[0034] Step 3: Put the Erlenmeyer flask on the electric furna...

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PUM

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Abstract

The invention discloses a method for measuring the concentration of total-iron ion in chemical cleaning solution containing a strong complex. A principle is as follows: in an acidic condition, silversulphate is a catalyst; a strong complex substance is oxidized by ammonium persulfate and hydrogen peroxide, so that the complexation to iron ion is lost; furthermore, divalent iron is converted intoferric iron; ferric iron is reduced to divalent iron through stannous chloride; excess stannous chloride is oxidized by mercury bichloride; finally, sodium diphenylaminesulfonate is used as an indicator; and the reduced divalent iron is oxidized by potassium bichromate. The method is simple and rapid to operate and high in sensitivity and accuracy; measurement can be carried out by a conventionalanalysis vessel; the measurement time for one time is not beyond 25 min; the detection limit is 10 mg/L; the recovery rate is 92.5-107.3%; the detection range is 100-12000 mg/L; and test requirementsin a chemical cleaning field can be completely satisfied.

Description

technical field [0001] The invention relates to the technical field of chemical cleaning of thermal equipment, in particular to a method for measuring the concentration of total iron ions in a chemical cleaning solution containing strong complexes. Background technique [0002] Chemical cleaning is an important technical measure to ensure the normal and reliable operation of thermal equipment. With the development of chemical cleaning technology, various strong complexes (such as amines such as EDTA, HEDTA, DPTA, NTA, etc.) are used as effective combinations of cleaning agents. sub use. In the traditional chemical cleaning process, the total iron ion content in the cleaning solution is measured by EDTA standard solution titration method. When the cleaning solution contains strong complexes, this method has low measurement accuracy, complicated operation, and long time consumption, which is difficult to meet the requirements of the chemical cleaning process. However, althoug...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 张祥金张贵泉姚洪猛文慧峰胡杨龙国军姚建涛陈立强孙雅萍
Owner XIAN THERMAL POWER RES INST CO LTD
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