THE CATALYTIC ADSORPTIVE STRIPPING VOLTAMMETRIC DETERMINATION OF CHROMIUM WITH DTPA AND NITRATE

The catalytic adsorptive stripping voltammetric determination of chromium using diethylenetriaminepentaacetic acid (DTPA) is only possible when chromium(III) is preliminarily oxidized to chromium(VI) which can be accomplished by UV-irradiation of the oxygen saturated solution at pH 6.0-7.0. A chromium(III)-chromium(VI) speciation can be performed in the range 10-10 mol/l upto 10-6 mol/l employing the coprecipitation of chromium(III) with Al(OH)3. The interference of other metal ions was also studied. © 1990 Springer-Verlag.