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A method is described for t he di.rect. photometric determillation of tungsten in steels. The san~pl e, .0.1 to 0.2 .g In weight, lS dJ ssolved in aqua r egia, and a sulfuri c-phosphoricperehlonc aCld mJxture lS added . The solu t ion is evaporated to fumes of s ulfuric acid and diluted to volume with diluted sulfuric acid (1 + 3) . An ali quot portion of the solution is treated with dithiol in ~iluted sulfuric acid. solu tion (1 + 3) contain ing sulfur dioxide, and molybdenum and certall1 other po tential lllterferences are r emoved by extraction with chloroform. Copper and other element~ forming in soluble dithiolates are removed by filtration. The t ung.sten-d1thJO.l c~)Inplex lS then forme.d , after the addition of hydrochloric aCid, stanno us chlonde, and dl thJO.I, an d extracted WJth bu tyl acetate. The absorbancy of the t ungs ten complex lS determllled at approx imately 635 mil. An accuracy of 0 .005 p ercent of tungsten , or better, is indicated in the range 0.05 to 0.50 percent of t ungst en, and of about 0.001 percent for amount s of less than 0.05 percent of tungsten . The applicat ion of t he method to titanium alloys is described in an appendix section .

Photometric determination of tungsten in steel and titanium alloys with dithiol