Indirect ultraviolet determination of silver with nickelocyanide ion by flow injection analysis.
A flow-injection method for the ultraviolet spectrophotometric determination of silver, based on its reaction with nickelocyanide ion, Ni(CN)(2-)(4), in ammoniacal buffer medium (pH 10) and subsequent measurement of the decrease in the absorption of the Ni(CN)(2-)(4) complex at 275 nm is described. The calibration graph is linear in the range 10-400 mum silver. At a sampling rate of about 60 samples h(-1) with 35 mul sample injections, precision was about 1% relative standard deviation. The proposed method was successfully applied to the determination of silver in some common silver minerals.
Haj-Hussein
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Chemistry Department, Yarmouk University, Irbid, Jordan.