Abstract
A method for the determination of silver at ng/l levels in seawater is described. Silver is extracted as the thiocyanato complex with trioctylmethylammonium chloride in xylene and subsequently back-extracted into 0.1 ml of nitric acid and 0.1 ml of 500μg/ml indium solution. The back-extracted solution containing indium as a matrix modifier is suitable for the determination of silver by graphite furnace AAS. The detection limit was found to be 1.3ng/l of silver in the initial solution based on a 150-fold preconcentration with a combined extraction and back-extraction. The proposed method is simple and rapid for the determination of ultra-trace amounts of silver in seawater.
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