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Method for determining content of sulfite in wet desulphurization slurry

A sulfite and wet desulfurization technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of interfering quantitatively and affecting the determination of sulfite content Accuracy and other issues to achieve the effect of improving accuracy and reliability, increasing anti-interference ability

Active Publication Date: 2013-06-12
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The reactions of formulas ③, ④, and ⑤ interfere with the quantitative progress of the reactions of formula ②, which affects the accuracy of the determination of sulfite content in desulfurization slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Add 50ml of pH 4.0 HAc-NaAc buffer solution to a 250ml stoppered iodine measuring bottle, and accurately add 10.00ml of 0.1mol / L iodine standard solution;

[0060] (2) Add the liquid phase sample filtered and separated from the desulfurization slurry to the iodine measuring bottle until the color of the iodine solution turns light yellow or light brown, and the amount added is 50ml;

[0061] (3) Add 1ml of 1% starch solution, titrate the sample with 0.1mol / L standard sodium thiosulfate solution, the end point of the titration is when the color of the solution disappears blue, record the consumed volume of 8.04 ml of sodium thiosulfate solution;

[0062] (4) Use distilled water with the same volume as the sample filtrate to do a blank experiment, and record the volume of sodium thiosulfate solution consumed as 9.95 ml.

[0063] Sulfite content (as SO 3 2- count) calculation:

[0064] SO 3 2- =(V 2 C-V 1 C) ÷(2V)

[0065] SO in liquid phase 3 2- The content ...

Embodiment 2

[0067] (1) Add 50ml of HAc-NaAc buffer solution with pH 5.7 to a 250ml stoppered iodine measuring bottle, and accurately add 10.00ml of 0.1mol / L iodine standard solution;

[0068] (2) Add the liquid phase sample filtered and separated from the desulfurization slurry directly into the iodine measuring bottle until the color of the iodine solution turns light yellow or light brown, and the amount added is 30ml;

[0069] (3) Add 1ml of 1% starch solution, titrate the sample with 0.1mol / L standard sodium thiosulfate solution, the end point of the titration is when the color of the solution disappears blue, and record the volume of sodium thiosulfate solution consumed as 4.58 ml;

[0070] (3) Use distilled water with the same volume as the sample filtrate to do a blank experiment, and record the volume of sodium thiosulfate solution consumed as 9.90 ml.

[0071] Sulfite content (as SO 3 2- count) calculation:

[0072] SO 3 2- =(V 2 C-V 1 C) ÷(2V)

[0073] SO in liquid phase...

Embodiment 3

[0075] For the comparative example of embodiment 2, according to the method of embodiment 2, use (1+1) H 2 SO 4 Tests were performed instead of HAc-NaAc buffer solution.

[0076] ⑴) Add 5ml (1+1) H to a 250ml stoppered iodine flask 2 SO 4 Solution, accurately add 10.00ml 0.1mol / L iodine standard solution;

[0077] (2) Add the liquid phase sample filtered and separated from the desulfurization slurry to the iodine measuring bottle until the color of the iodine solution turns light yellow or light brown, and the amount added is 30ml;

[0078] (3) Add 1ml of 1% starch solution, titrate the sample with 0.1mol / L standard sodium thiosulfate solution, the titration end point is when the color of the solution disappears blue, and record the volume of sodium thiosulfate solution consumed as 5.06 ml;

[0079] (4) Use distilled water with the same volume as the sample filtrate to do a blank experiment, and record the volume of sodium thiosulfate solution consumed as 9.91 ml.

[00...

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Abstract

The invention relates to a method for determining the content of sulfite in a wet desulphurization slurry. The method comprises the following determination steps: 1, adding 50ml of an acetic acid-sodium acetate buffer solution having a pH value of 4.0-5.7 and 10.00ml of a 0.1mol / L iodine standard solution to a stopper possessed measuring flask; 2, adding a tested sample filtrate until the iodine solution becomes flavescent or tannish, and carrying to a laboratory under a dark condition; 3, adding 1ml of a 1% starch solution to make the tested sample become blue; 4, titrating the sample solution with a 0.1mol / L sodium hyposulfite standard solution until the blue color disappears, and recording the consumption amount of the sodium hyposulfite standard solution; carrying out a blank experiment; and 6, calculating to obtain the content of sulfite. The method which allows the buffer solution to be added in the sampling process has the advantages of avoiding of the oxidation in the sampling process, prevention of the interference of components comprising S2O3<2-> and the like in the test process, increase of the interference resistance of the slurry in the sampling and testing process, and improvement of the accuracy and the reliability of the test result.

Description

technical field [0001] The invention belongs to the technical field of industrial analysis and measurement methods, and relates to a method for determining the content of sulfite in wet desulfurization slurry. Background technique [0002] The sulfite content is an important indicator to measure the oxidation status of the wet flue gas desulfurization system, and it is a must-test item for production and operation. The iodometric method is usually used to determine the content of sulfite. The basic principle is: in the presence of excess iodine standard solution, sulfite reacts with excess iodine, and the remaining iodine is titrated with sodium thiosulfate solution. The sulfite content was calculated indirectly from the amount of sodium thiosulfate consumed. Its main chemical reaction is: SO 3 2- +I 2 +H 2 O=SO 4 2- +2H + +2I - ①, 2Na 2 S 2 o 3 +I 2 = Na 2 SO 4 +2 NaI ②. [0003] GB21508-2008 "Performance Test Method for Coal-fired Flue Gas Desulfurizatio...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 宋晓红张志强
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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