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