Tungsten, molybdenum and vanadium were determined simultaneously by using organic solvent extraction-spectrophotometric method. From the sample solution which contained these three elements, molybdenum and vanadium were first extracted into chloroform layer in the presence of potassium xanthate, molybdenum was determined at 550 mμ, and vanadium at 375 mμ. Then tungsten was extracted by 2 per cent oxine-chloroform solution from the remaining solution after the extraction of molybdenum and vanadium, and was measured at 400 mμ. Although many other elements, such as iron, nickel and etc., disturbed this method, they were removed by using magnetic mercury cathod electrolysis and other method.
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