Determination of traces of heavy metals in positively charged inorganic colloids in fresh waters |
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Authors: | Sujith Tillekeratne Tomoo Miwa Atsushi Mizuike |
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Affiliation: | (1) Faculty of Engineering, Nagoya University, Nagoya, Japan |
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Abstract: | Summary Determination of Traces of Heavy Metals in Positively Charged Inorganic Colloids in Fresh WatersAfter removal of suspended particulate matter by centrifugation followed by filtration through 0.4- m membrane filters, humic substances and other negatively charged species are sorbed on a small column of macroreticular weak-base anion exchanger DEAE-Sephadex A-25 at fast flow rates. Positively charged inorganic colloids pass through the column and are collected on a 0.015- m membrane filter, which is then ultrasonically treated with 1M nitric acid for the determination of copper, lead and cadmium by differential pulse anodic stripping voltammetry with a static mercury drop electrode. Up to O.2 g 1–1 of the heavy metals are found in positively charged inorganic colloids in river, pond and tap waters. |
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