Abstract
The spectrophotometric method proposed for the determination of micro amounts of silver(I) is based on the formation of dicyanoargentate(I) and its extraction into 1,2-di-chloroethane as an ion pair with méthyléne blue. The absorbance of the extract is stable for at least 3 days in a glass-stoppered tube. The apparent molar absorptivity for silver at 657 nm is 99500 l mol -1 cm -1 and the Sandell sensitivity is 0.0011μg Ag cm -2 for 0.001 absorbance. Linear calibration graphs are obtained over the range 2.8 × 10 -7–1.0 × 10 -5 M silver(I) (0.3–10.8μg Ag in 10 ml; at the 6 × 10 -6 M silver(I) level, the relative standard deviation is 0.3%. Very high selectivity is achieved with EDTA as masking agent.
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