Rapid polarographic method for determining arsenic in steel.

A simple and sensitive polarographic method for determining arsenic in steel is presented. The steel is dissolved in HNO(3), and arsenic reduced with Na(2)S(2)O(5)-K.I. The polarographic wave is recorded for an electrolyte at pH 3.0 and containing Fe(II), Mn(II). citric and ascorbic acids. Levels of 0.2% and 0.003% As can be determined with a coefficient of variation of +/- 6%.