Determination of Tungsten Content of Impure Tungsten Products

A method for the determination of impurities in the tungsten content in the tungsten products, tungsten and impurities completely independent of each other, characterized in that, the sample was calcined to oxide conversion; sodium hydroxide solution to dissolve and purify, so that the tungsten trioxide is totally and completely decomposed, and as the impurity element and the insoluble oxide precipitate in the bottom left; direct quantitative draw tungstate supernatant was acidity of pH4.0-5.0, micro-boiling, organic precipitant 8- hydroxyquinoline quantitative precipitation of tungsten, and incubated in a water bath 60-70 ℃; ashing the organic precipitate, is ultimately fired at 700-800 ℃, tungsten fully and completely burning a tungsten trioxide, weighed and This calculates the tungsten content of the sample.

The method of the present invention is simply to eliminate interference of impurity elements, which greatly increases the speed of analysis, accuracy of analysis, the test results with good reproducibility.


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