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Forgeries of antique silver objects can be identified by their fingerprints of impurities. The dissolution of the samples causes severe problems since Au and Ag have to be dissolved simultaneously. In order to overcome that difficulty and to minimize the amount of sample, an ETV-ICP-MS method is presented based on solid sampling and an in-situ-digestion with nitric acid in a graphite tube. Determinations of Au, Bi, Cd, Pb, Sb, Sn and Zn were performed in a range of 10 μg/g–1% and with an accuracy of 10%–50%. Less than 1 mg sample material is required.

fresenius' journal of analytical chemistry

Determination of impurities in micro-amounts of silver alloys by electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS) after in-situ-digestion in the graphite furnace