Three sediment samples from the Gulf of Mexico abyssal plain were subjected to five representative handling and storage procedures before the pore water was expressed and analyzed for Na+, K+, Mg2+, and Ca2+. The observed alterations in major cation concentrations during storage did not appear to be entirely related to temperature. Samples stored at in situ temperatures unexpectedly displayed greater changes than those which were stored at room temperature and subsequently rechilled.

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