SELECTIVE DETERMINATION OF CR(VI) BY INDIRECT ATOMIC-ABSORPTION SPECTROSCOPY

A simple, sensitive and rapid indirect method for the determination of chromium(VI)is described. The method is based on the reduction of chr omium(VI) to chromium(III) with elemental mercury in sulphuric acid me dium. The oxidized mercury in return was determined by atomic absorpti on spectroscopy and used as a measure of chromium(VI) in the sample. E ffects of a number of possible interferences on the determination have been checked and some synthetic and real samples of chromium(VI) have been analysed by the described method as well as by a reference spect rophotometeric method.