Abstract

NON-EXTRACTIVE SECOND DERIVATIVE SPECTROPHOTOMETRIC DETERMINATION OF CD(II) IN ENVIRONMENTAL, SOIL, BIOLOGICAL, MEDICINAL AND GREEN LEAFY VEGETABLE SAMPLES USING 2- BENZOYLPYRIDINE 4- METHYL-3-THIOSEMICARBAZONE (BPMT)

*V. Saleem Basha and K. Hussain Reddy

Abstract

2-benzoylpyridine 4-methyl 3- thiosemicarbazone (BPMT) is proposed as a new sensitive, selective, direct and non-extractive chromogenic reagent for extractive spectrophotometric determination of trace amounts of cadmium (II) in aqueous dimethyl formamide (DMF). BPMT reacts with cadmium (II) to give a greenish yellow colored complex 1:1 complex in ammonium chloride-ammonium hydroxide buffer medium of pH 8.0 at λmax 400 nm. The color reaction has been investigated in detail. The molar absorptivity and Sandell’s sensitivity are found to be 1.6 x 104 Lmol-1 cm-1, and 0.00702 μgcm-2 respectively. The interference of various diverse ions has also been studied. The method has been successfully applied for the nonextractive second derivative spectrophotometric determination of trace amounts of Cd (II) in several standard reference materials such as Environmental, soil, Biological Samples, Medicinal, and green leafy vegetable samples.

Keywords: Cadmium, Spectrophotometry, Environmental, leafy vegetables, Biological, medicinal Samples.