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Mar Pollut Bull. 2004 Aug;49(4):295-8.

Freezing of sediments inappropriate for pore water selenium analysis.

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  • 1Centre for Advanced Analytical Chemistry, CSIRO and Energy Technology, Private Mailbag 7, Bangor, NSW 2234, Australia.


The common practice of freezing sediment cores for later chemical investigation was shown to be inappropriate for samples containing selenium. Pore waters from frozen estuarine sediment cores contained up to eighty times the selenium content of those extracted from chilled but unfrozen cores. Experiments suggested that the increase in selenium concentrations resulted from rupturing the cells of selenium-accumulating bacteria present in the samples.

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