Determination of organically-associated trace metals in estuarine sea-water by solvent extraction and atomic-absorption spectrometry |
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Authors: | Hayase K Shitashima K Tsubota H |
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Affiliation: | Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730, Japan. |
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Abstract: | Chloroform extraction of trace metals (Ni, Cu, Mo, Mn, Cd and Pb) in estuarine sea-water was studied at pH 8 and pH 3, on the basis that the metals would be associated with dissolved organic matter (DOM), which has recently been characterized by reversed-phase liquid chromatography. Ni, Cu, Mo and Mn were extracted more at pH 8 than at pH 3. Cd and Pb were not associated with the DOM at either pH 8 or 3. The percentage of the total dissolved trace metals in sea-water associated with DOM varied from 0 to 14%. The metals extracted into chloroform at pH 8 were assumed to be associated with neutral or weakly basic DOM while at pH 3 they could be associated with either the neutral (or weakly basic) DOM or two types of acidic DOM. |
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