Natural bottom sediment samples, including those with a fairly high cation exchange capacity, from both the fresh and estuarine parts of the Hudson River contained comparably small quantities of exchangeable sodium (average 2.2 milliequivalents per 100 grams). When natural fresh water muds were artificially mixed with increasing increments of sea water, the muds were able to absorb a maximum of only 0.8 milliequivalents of exchangeable sodium at salinities up to 5 per mille. At salinities above 5 per mille even up to 30 per mille (open sea water), the muds accepted no more than 1.45 millequivalents.

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