Electrochemical analysis of antichemotherapeutic drug zanosar in pharmaceutical and biological samples by differential pulse polarography.

The electrochemical reduction of zanosar was investigated systematically by direct current polarography, cyclic voltammetry, and differential pulse polarography (DPP). A simple DPP technique was proposed for the direct quantitative determination of anticancer drug zanosar in pharmaceutical formulation and spiked human urine samples for the first time. The reduction potential was -0.

WITHDRAWN: Selective spectrophotometric determination of cobalt(II) in various environmental samples with 2-(chromen-2'-onyl)-5(4''-chlorophenyl)1,3,4-oxadiazole.

The present work describes a selective, rapid and economical spectrophotometric method for the determination of cobalt(II) in various environmental samples. The method is based on the formation of pink colored complex of a stoichiometric ratio 1:2 between cobalt(II) and 2-(chromen-2'-onyl)-5-(4''-chlorophenyl)1,3,4-oxadiazole at pH 6.0+/-0.