Determination of Molybdenum in Ferrotungsten with Citric Acid Masked Tungsten Thiocyanate Spectrometric Method

The sample is decomposed with sodium superoxide,than to separate iron and manganese from tungsten and molybdenum. After complexing the tungsten with citric acid,the molybdenum content is determined in about 11 mol/L sulfuric acid with thiocyanate spectrometric method using copper salt as catalyst and sulfocarbamide as reductant. The analytical results are satisfactoty.

Citric acid is a weak organic acid with the formula C6H8O7. It is a natural preservative which is present in citrus fruits. It is also used to add an acidic or sour taste to foods and drinks. In biochemistry, the conjugate base of citric acid, citrate, is important as an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms. It consists of 3 carboxyl (R-COOH) groups.

Citric acid is a commodity chemical, and more than a million tons are produced every year by fermentation. It is used mainly as an acidifier, as a flavoring, and as a chelating agent.

 

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