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Determination of uranium in marine sediment pore waters by isotope dilution inductively coupled plasma mass spectrometry
Authors:Joseph Toole  Keith McKay  Murdoch Baxter
Institution:Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QU Great Britain
Abstract:Inductively coupled plasma mass spectrometry (ICP-MS) was used in an isotope dilution mode to assay small-volume (0.25 ml) sediment pore waters for their uranium contents, using 236U as the spike. The only pretreatment required was a simple dilution by a factor of 20, which gave sufficient volume for three replicate analyses per sample. Rapid and accurate results were obtained for a variety of samples and standards, ranging in concentration from 0.05 to 10 ng U ml?1. A suite of 30 samples can be analysed in less than 6 h by this method. The relative standard deviation was better than 1.9%, with a detection limit, based on 3σ background, of 2 pg U ml?1 in solution (40 pg ml?1 in samples). Sea water is a difficult matrix for ICP-MS and thus the method is generally suitable for uranium determinations in many other sample solutions.
Keywords:Mass spectrometry  Plasmas  Isotope dilution  Sea water  Uranium  Waters
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