Interaction of metals and protons with algae. 3. Marine algae, with emphasis on lead and aluminum

来自 ACS

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作者：

RH Crist，K Oberholser，J Mcgarrity，DLR Crist，JM Brittsan

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摘要：

The proton uptake rate for intact cells of marine algae is 20 times faster than for freshwater (FW) species, partly due to a higher Na content, but also possibly due to differences in cell wall porosity. Metal displacement by protons on acidification (pH change from 7 to 1) shows two inflection ranges, one at ca. pH 5 due to the presence of carboxylate anions and the other at pH ca. 1.5 for sulfate groups. Cladophora, Rhizoclonium, and Polysiphonia each have the two inflection ranges, while Enteromorpha and freshwater Vaucheria (FW) each have only one, for sulfate and carboxylate, respectively. Sulfate analysis of Cladophora indicates a sulfate polymer content of ca. 8.2%, which is comparable to that estimated from metal release. Adsorption of Pb and Al on Rhizoclonium under acidic conditions (metals present as ions) releases H, Ca, and Mg ions from the algae, while adsorption of Pb and Cd at pH 10 and Al at pH 5, where these metal ions are present in very low concentration in equilibrium with solid hydroxide, also releases OH from the hydroxides.

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关键词：

AUTOMATIC SAMPLER WATER QUALITY RAINFALL

DOI：

10.1021/es00027a007

被引量：

777

年份：

1992