IODOMETRIC MICROGRAM DETERMINATION OF CHROMIUM(III) AND (VI) BY USE OF CHEMICAL AMPLIFICATION REACTIONS

A simple, rapid and sensitive method is described for the iodometric d etermination of microgram amounts of chromium(III), based on the oxida tion of chromium(III) with periodate at pH 3.2, removal of the unreact ed periodate by masking with molybdate and subsequent iodometric deter mination of the liberated iodate. Chromium(VI) can be determined by th is method after prior reduction to chromium(III) with sodium sulphite. The method can also be used for the analysis of organochromium compou nds.