Lake and reservoir water quality affected by metals leaching from tropical soils, Bangladesh |
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| Authors: | Md R Islam W P Lahermo R Salminen S Rojstaczer V Peuraniemi |
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| Institution: | (1) Department of Geology, Washington State University, P.O. Box 64-2812, Pullman, WA 99164, USA Fax: 509-335-7816 e-mail: riajulislam@yahoo.com, US;(2) Division of Earth and Ocean Sciences, Duke University, P.O. Box 90227, Durham, NC 27708–0227, USA, US;(3) Quaternary and Environmental Geology, R & D Section, Geological Survey of Finland. P.O. Box 96, FIN-02151 Espoo, Finland, FI;(4) Institute of Geosciences and Astronomy, University of Oulu, 90570 Oulu, Finland, FI |
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| Abstract: | The release of metals during weathering has been studied in order to assess its geochemical controls and possible effects
on environmental health in Bangladesh. A total of 27 soil samples and 7 surface water samples were collected from four locations
covering three major regions in the country. Results show that weathering effects are a strong function of climatic conditions.
Surface waters are typically enriched in Al, Mg, Ca, Na, K, As, Ba, Cr, Cu, Ni, Pb and Zn. The solubility of metal ions, organometallic
complexes, co-precipitation or co-existence with the colloidal clay fraction are the main processes that lead to metal enrichment
in lake and reservoir water. Aluminium concentrations exceed World Health Organization (WHO) drinking-water standards in all
samples, and in two regions, arsenic concentrations also significantly exceed WHO standards. The elevated levels of As indicate
that arsenic contamination of water supplies in Bangladesh is not confined to groundwater.
Received: 4 June 1999 · Accepted: 17 August 1999 |
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| Keywords: | Soil Metals Leaching Surface water quality Bangladesh |
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