Catalytic microdetermination of chromium(VI).
An automatic spectrophotometric kinetic method for the microdetermination of chromium(VI) is described, based on catalysis of the hydrogen peroxide-iodide reaction. The time required for the reaction to produce a small fixed amount of tri-iodide is measured automatically, and is proportional to the chromium(VI) concentration. Maximum tolerable amounts of various interfering ions were investigated. From 0.6 to 3.0 mug of chromium(VI) can be determined with relative errors of 1-2%, with measuring times of 10-50 sec.
Hadjiioannou
T P
TP
Laboratory of Analytical Chemistry, University of Athens, Athens, Greece.