Abstract
Cd 2+ 2HCO3 + CdCO3 H2 OC O 2, ++ = in the other. The pH of seawater was varied within the range of 7.6-7.9 by adding minor aliquots of acidic seawa- ter in which some NaCl (0.2 M) was substituted for an equivalent amount of HCl. The solid phase : solution weight ratio in both experimental sets was 1 : 100. The ini- tial experimental temperature was 23-25°e and changed to 25 ± 1°e within the last two months. Over five months (a time span needed to reach unchanging Cd concentra- tions and pH values) the samples were periodically stirred with the lid of the vessel open to equalize the ee 2 partial pressure in the solution and atmospheric air. In preparation for their analysis, the samples were filtered through a 0.45- µ m membrane filter, after which the filtrate was ana- lyzed for Cd concentration by atomic absorption in acety- lene-air flame, and the pH value was measured potentio- metrically (the accuracies were ± 2% and ± 0.005 % pH).
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