Abstract
Determination of chromium(VI) by addition of weighed amounts of solid ammonium ferrous sulfate in excess and back-titration with permanganate, using spectrophotometric end-point detection, is applied to the determination of chromium in steel. Except in the case of vanadium. and especially of vanadium + tungsten, very high selectivity and precision are claimed. Relative standard deviations of the order of 0.05% to 0.15% were found. Recoveries in excess of 99.95% were obtained in most cases. Results for the determination of chromium in standard samples of steel are given.
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