Accumulation of heavy metals in freshwater molluscs

Lau, Seng and M, Mohamed and A Tan, Chi Yen and S, Su'ut (1998) Accumulation of heavy metals in freshwater molluscs. Science of The Total Environment, 214 (1-3). pp. 113-121. ISSN 0048-9697

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

Heavy metals in the aquatic environment have to date come mainly from naturally occurring geochemical materials. However, this has been enhanced by human activity such as gold mining in the case of heavy metal pollution in Sg Sarawak Kanan. The high suspended solid loads in the river have quite efficiently removed most soluble metals from the water and trapped them in the bottom sediment. Three freshwater mollusc species were collected at the point source of the heavy metal pollutants and analysed for the heavy metal contents in their tissues and shells. Two of the mollusc species (Brotia costula and Melanoides tuberculata) are purely freshwater species while the Clithon sp. nr retropictus is able to survive in fresh and brackish water environments. The Brotia costula and the Clithon sp. are the edible species which are sold in the market. Accumulation of As, Cu, Fe, Se and Zn in all the three mollusc species were determined and the level of As in the tissues of Brotia costula and the Clithon sp. was much higher than the permissible level for human consumption. The mollusc species also demonstrated different preferences for the uptake of different metals. Variations in the heavy metal contents in the shell and tissues of the same species were also observed.

Item Type: Article
Uncontrolled Keywords: Bioaccumulation; Freshwater; Heavy metals; Molluscs , unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education , research, Universiti Malaysia Sarawak.
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > Q Science (General)
Divisions: Academic Faculties, Institutes and Centres > Institute of Biodiversity and Environmental Conservation
Depositing User: Karen Kornalius
Date Deposited: 24 Jun 2015 02:14
Last Modified: 24 Jun 2015 02:14
URI: http://ir.unimas.my/id/eprint/7424

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