Add time:07/25/2019         Source:sciencedirect.com

Glyoxal dithiosemicarbazone forms hypsochromic complexes of ML with silver(I), mercury (II), copper(II) and palladium(II); the logarithmic overall stability constants are 28.1, 23.6, 22.5 and 23.2, respectively. The complexes are formed in the pH interval 1.0–7.0. Complexes of silver(I) and mercury (II) may be used for the photometric determination of these elements at pH 1.1±0.1 in the presence of EDTA. Effective molar absorptivities are 43,000 and 44,000 cm2 mmole−1 at 335 nm. Of 30 cations and 15 anions studied, only bromide, iodide, thiocyanate and thiosulfate interfere at molar ratios of 2.5–5 for 0.2 μmole of silver(I) or mercury(II). Other ions usually interfere only above the molar ratio 150. With regard to mutual interference of silver(I) and mercury(II), silver(I) may be masked by chloride so that the determination of mercury (II) is possible up to the molar ratio 10.

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