A method is described for the determination of arsenic and has been applied successfully to iron, steel, copper-base alloys, tin-and lead-base bearing metals, and pig lead.The arsenic is first separated from the other constituents of the material by distillation as the trichloride.It is then oxidized to arsenic acid and converted to a blue arsenic-molybdenum compound by treatment with a solution containing hydrazine sulfate and ammonium molybdate.The transmittancy of the colored solution is measured with a photoelectric colorimeter, and the amount of arsenic read from a curve obtained by using known amounts of arsenic.Alternatively, the color may be matched against standards by means of a visual colorimeter.The method is reasonably rapid and is applicable to amounts of arsenic as small as 2 micrograms.I. II.III. IV.
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C.J. Rodden (1940) studied this question.