Abstract
A microanalytical procedure is described for the quantitative separation of Ag from natural samples by anion exchange and analysis by surface ionization mass spectrometry using silica gel as an emitter. The isotopic composition of 50 pmol of Ag can be measured on a Faraday detector with a precision of 0.1%. Isotopic measurements have been made on as little as 0.15 pmol with a precision of 1% using an electron multiplier detector. The total procedural blank for the anion exchange Separation is 0.15 pmol. Using stable isotope dilution 0.5 pmol of Ag, which Is 3 X 10^(11) atoms, can be measured with a precision of better than 1% with only a 30% blank correction. This allows the accurate determination of Ag in natural samples down to concentration levels of 1 pmol per gram. The ionization efficiency for Ag is about 1-2% and the detection limit is 1 fmol. This procedure has been applied to several meteorites, and a standard terrestrial rock.
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