ZERO-CROSSING DERIVATIVE SPECTROPHOTOMETRIC DETERMINATION OF MERCURY(II) AND PALLADIUM(II) WITH YHYDROXYPHENYLMETHYLENE)-2-THIOXO-1,3-THIAZOLIDINE AND CETYLTRIMETHYLAMMONIUM BROMIDE

A method is proposed for the simultaneous determination of mercury(II) and palladium(II) by first-derivative spectrophotometry based on the absorption spectra of their complexes with 5-(3, yhydroxyphenylmethyle ne)-2-thioxo-1,3-thiazolidine [5-(3,4-methoxyhydroxybenzylidene) rhoda nine]. Zero-crossing measurement technique is found suitable for the m easurement of the first- derivative value at the specified wavelengths , Mercury(II) (0.4-1.4 mu g ml(-1)) and palladium(II) (0.08 - 1.8 mu g ml(-1)) in different ratios have been determined simultaneously. A cr itical evaluation of the proposed method is performed by statistical a nalysis of the experimental data.