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(4-(2-thiazolylazo)-1,2,3-trihydroxybenzene spectrophotometric method used for determining trace wolfram in steel

A spectrophotometric method and thiazole azo technology, applied in the field of casting, can solve the problems of large interference, cumbersome steps, and poor sensitivity, and achieve the effect of high sensitivity, overcoming large interference, and reliable method

Inactive Publication Date: 2015-05-13
QINGDAO TIANHENG MACHINERY
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Problems solved by technology

At present, the determination methods of tungsten include thiocyanate photometry, fluorone photometry, catechol violet method, derivative photometry and enrichment-spectrophotometry, etc. Most of these methods have large interference, poor sensitivity, and steps cumbersome disadvantages

Method used

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Embodiment

[0015] The 4-(2-thiazolylazo)pyrogallol spectrophotometric method for measuring trace amounts of tungsten in steel of the present embodiment comprises the following steps:

[0016] (1) Main instruments and reagents: Spectrophotometer 722 (Shanghai No. 3 Analytical Instrument Factory); UV-754 Spectrophotometer (Shanghai No. 3 Analytical Instrument Factory); Tungsten (Ⅵ) standard stock solution: 1.0000g / L , prepared by conventional method with sodium tungstate; diluted to 10 μg / mL tungsten (Ⅵ) standard working solution when used; chromogenic agent 4-(2-thiazolylazo)pyrogallol (TATB, self-made) solution: 1 ×10-3mol / L, accurately weigh 0.2372g TATB and dissolve in 200mL dimethylformamide (DMF), dilute with water to 1L; sulfuric acid: 0.2mol / L; cetylpyridinium bromide (CPB) solution: 5g / L; the above reagents are analytically pure, and the test water is distilled water;

[0017] (2) Determination method: draw 2.0mL of tungsten (Ⅵ) solution into a 25mL volumetric flask, add 3.0mL of...

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Abstract

The invention discloses a (4-(2-thiazolylazo)-1,2,3-trihydroxybenzene spectrophotometric method used for determining trace wolfram in steel. According to the (4-(2-thiazolylazo)-1,2,3-trihydroxybenzene spectrophotometric method, in the presence of dilute sulphuric acid medium and cetyl pyridinium bromide (CPB), agent (4-(2-thiazolylazo)-1,2,3-trihydroxybenzene (TATB) and wolfram (VI) are subjected to chromogenic reaction so as to realize determination of trace wolfram in steel. It is shown by research that, a red complex is generated at a TATB / wolfram (VI) ratio of 2:1, and maximum absorption wavelength of the red complex is 530nm. The results obeys Lambert-Beer Law in a 25ml solution when the amount of wolfram ranges from 0 to 40<mu>g, and apparent molar absorption coefficient is 61600L*mol<-1>*cm<-1>. The (4-(2-thiazolylazo)-1,2,3-trihydroxybenzene spectrophotometric method is used for determination of trace wolfram in steel, and results are identical with results obtained via thiocyanate spectrophotometry.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a 4-(2-thiazolylazo)pyrogallol spectrophotometric method for measuring trace amounts of tungsten in steel. [0003] Background technique [0004] Tungsten is an important element in steel, which can significantly improve the strength of steel, so the determination of tungsten in steel samples has practical significance. At present, the determination methods of tungsten include thiocyanate photometry, fluorone photometry, catechol violet method, derivative photometry and enrichment-spectrophotometry, etc. Most of these methods have large interference, poor sensitivity, and steps The disadvantage of cumbersome. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a 4-(2-thiazolylazo)pyrogallol spectrophotometric method f...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/38
Inventor 刘升迁
Owner QINGDAO TIANHENG MACHINERY
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