[CCD-diode array spectrophotometry used for simultaneous determination of cadmium and lead]

A new spectrophotometric setup for simultaneous determination of lead and cadmium has been developed. It is composed of charge coupled device (array detector), multichromatic instrument and computer. The optimum chromogenic conditions of meso-tetra (4-trimethylammoniumphenyl) porphine (TAPP) with cadmium and lead were studied and reported in this paper. The linear ranges of Pb and Cd were 0-0.50 microgram/ml and 0-0.20 microgram/ml respectively. The detection limits were 0.001 microgram/ml for both Pb and Cd. The proposed method has been successfully applied to the simultaneous determination of cadmium and lead in the synthetic samples and the soaking solutions of ceramics and enamel. The recoveries of spiked samples ranged from 84.4%-118.6% and the average recovery was 100.8% with RSD of 1.0%-9.1%. The proposed method is more sensitive, more accurate and faster than the traditional one, it can be used to simultaneously determine multiple elements.