Catalytic Spectrophotometric Determination of Chromium

Authors : Angelina Miltcheva STOYANOVA

Pages : 367-375

View : 16 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The catalytic effect of chromiuminsert ignore into journalissuearticles values(III); and chromiuminsert ignore into journalissuearticles values(VI); on the oxidation of sulfanilic acid by hydrogen peroxide was studied. The reaction was followed spectrophotometrically by measuring the absorbance of the reaction product at 360 nm. Under the optimum conditions 2 calibration graphs insert ignore into journalissuearticles values(for chromiuminsert ignore into journalissuearticles values(III); up to 100 ng mL-1, and for chromiuminsert ignore into journalissuearticles values(VI); up to 200 ng mL-1); were obtained, using the ``fixed time`` method with detection limits of 4.9 ng mL-1 and 3.8 ng mL-1, respectively. The results suggest that at the reaction conditions chromiuminsert ignore into journalissuearticles values(VI); is reduced and chromiuminsert ignore into journalissuearticles values(III); is oxidized to an intermediate oxidation state and the catalytic action of chromium is due to the formation of an active complex between oxidant, catalyst and substrate. A new catalytic spectrophotometric method for the determination of chromium was developed. The proposed method was successfully applied to chromium determination in tap and industrial waters.
Keywords : Chromium, catalytic determination, sulfanilic acid, hydrogen peroxide, tap and industrial waters