Abstract
Six sediment and one seawater samples were collected from the Arabian Gulf. Seawater was modified to represent salinities from 35 to 70 ‰, sulfate from 2200 to 11500 mg 1−1 and carbonate from 600. to 4500 mg 1−1. The sediments were suspended in the modified seawater and spiked with 25 mg kg−1 of Al, Ba or Cu. Important complexes of Al, Ba and Cu in seawater were A1(OH)3°, A1(OH)4 , BaCl2°, BaSO4°, Cu(OH)2° and CuCo3°. Salinity of seawater increased concentrations of Al, Ba and Cu. Seawater sulfate had no effect on the solubilities of these elements, however carbonate concentrations negatively influenced Ba solubility.