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Results for the direct determination of trace amounts of Pb and Cd in Antarctic and Greenland ancient ice and recent snow by laser-excited atomic fluorescence spectrometry (LEAFS) are presented. The whole procedure starting from field sampling, mechanical decontamination of the samples in an ultra-clean laboratory and final analysis of the decontaminated samples is described. The measured concentrations varied in the ranges 0.1–3 pg ml–1 for Cd and 0.3–30 pg ml–1 for Pb. The results for direct analysis by LEAFS agree favourable with those obtained by isotope dilution mass spectrometry and electrothermal atomic absorption spectrometry, which require time-consuming pre-treatment and pre-concentration stages.
Samples of ice and snow were melted and acidified with 0.1% HNO3. The soln. was analysed directly by laser-excited AFS with a LAFAS-1 instrument (ISAN) in which a dye laser was pumped by a XeCl excimer laser and electrothermal atomization was used. Lead atoms were excited at 282.2 nm with direct-line fluorescence measurement at 405.8 nm; Cd atoms were excited and measured at 228.8 nm. Results are presented and compare favourably with those obtained by isotope-dilution MS and electrothermal AAS.
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Journal of Analytical Atomic Spectrometry
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