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A method is described for the absorptiometric determination of palladium, in the range 0.1-2.5 ppm, with 2,3-quinoxalinedithiol (H(2)qdt) in aqueous ethanol. The reagent, S-2-(3-mercaptoquinoxalinyl) thiuronium chloride (mgt), is hydrotysed rapidly to (qdt)(2-) at pH 10. In the presence of zinc, (qdt)(2-) is stabilized by complex formation and reagent… (More)