Abstract
A new catalytic method for the determination of silver(I) was developed based on a metal exchange reaction between ethylenediaminetetraacetatomercury(II) (Hg II-EDTA) in the aqueous phase and bis(diethyldithiocarbamato)copper(II) (Cu II-DDTC) in the organic phase. This exchange reaction (Cu II-DDTC org+Hg II-EDTA→Hg II-DDTC org+Cu II-EDTA, where org denotes the organic phase) was observed to proceed slowly and the Cu II-DDTC complex transferred quantitatively to Hg II-complex in the organic phase in the equilibrium state. In this system, silver(I) acts as the catalyst and can be determined by measuring the decrease in the absorbance of the Cu II-DDTC complex ( λ max=435 nm). The reaction was applied to the extractive flow injection analysis of silver(I). The present method allows the determination of silver(I) at 10 −7 mol dm −3 level with the sampling frequency of 30 h −1. The relative standard deviation of 0.28% ( n=10) was obtained at 4.0×10 −7 mol dm −3 of silver(I).
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