Method for rapidly determining content of selenium in industrial selenium dioxide by discontinuous iodometry

A technology for rapid determination of selenium dioxide, which is applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. There are problems such as pollution in the environment, and the effect of clear end point, accurate result and low cost can be achieved

Inactive Publication Date: 2014-05-07
BAIYIN NONFERROUS GROUP
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  • Method for rapidly determining content of selenium in industrial selenium dioxide by discontinuous iodometry

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[0017] The following describes the implementation process of the present invention with a specific test process.

[0018] Main reagent preparation

[0019] KI 0.1% aqueous solution, ready to use.

[0020] Starch solution 0.5% aqueous solution, freshly prepared.

[0021] Nitrate-sulfur mixed acid 1+1+1

[0022] Selenium standard solution (10mg / mL) Accurately weigh 1.0000g high purity selenium into a 250 mL beaker, add 20mL nitrate-sulfur mixed acid (1+1+1), heat and dissolve in a boiling water bath, and transfer it to a 100mL volumetric flask after cooling. Dilute to the mark with water and shake well.

[0023] Na 2 S 2 O 3 Standard solution C≈0.1mol / L

[0024] Weigh Na 2 S 2 O 3 ·5H 2 O (molecular weight: 248.19) 25 grams and 0.2 grams of anhydrous sodium carbonate are placed in a 500mL beaker, dissolved in deionized water after boiling and cooled, filtered in a 1000mL volumetric flask, and then diluted with the above water to the mark and shaken well, after a week Calibration.

[0025] ...

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Abstract

The invention discloses a method for rapidly determining the content of selenium in industrial selenium dioxide by a discontinuous iodometry. According to the method, a starch indicator is added into a hydrochloric acid medium; a newly-prepared potassium iodide solution is dropwise added; after the solution is obviously blue, a sodium thiosulfate standard solution is immediately utilized for titration until the blue is vanished; then the potassium iodide solution is dropwise added until the solution is obviously blue, the sodium thiosulfate standard solution is utilized for titration until the blue is vanished; the process is repeated until the blue is not deepened when the potassium iodide is dropwise added; the solution is continuously titrated to a final point according to a traditional iodometry. The method has the clear final point, is rapid to operate and has an accurate result.

Description

technical field [0001] The invention relates to an analysis method for fast measurement of selenium content in selenium dioxide, in particular to a method for fast determination of selenium content in industrial selenium dioxide by intermittent iodometric method. Background technique [0002] For the determination of the amount of selenium in selenium dioxide, a by-product of chemical industry and smelting, the industry standard and enterprise standard respectively adopt the indirect iodometric method and the back titration method in the direct iodometric method. When selenium is determined by the iodometric method in the industry standard, excess potassium iodide is directly added, and the iodine generated quantitatively by reaction is titrated with sodium thiosulfate standard solution. During the titration, the monomer red selenium precipitated at the same time during the reaction affects the judgment of the end point and makes the measurement result unstable. The determi...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/78
Inventor 韦文辉王冬珍陈瑾霞郑燕萍
Owner BAIYIN NONFERROUS GROUP
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