Heavy metal in bivalve and sediment at coastal Terengganu

Abstract

The study on the content of heavy metal in tissue bivalve and sediment collected from coastal Terengganu include Kerteh River (2 stations), Marang River (5 stations) and Setiu Wetland (5 stations) was conducted during April and May 2010. The study on the depuration of heavy metal by bivalve Crassostrea sp. was also conducted. The elements of heavy metal analyzed were Cadmium (Cd), Copper (Cu), Iron (Fe), Lead (Pb) and Zinc (Zn). The concentration of Cd, Cu, Zn, Pb and Fe in tissue ranged from 0.199 - 0.718 mg/kg dry weight, 1.988 - 22.133 mg/kg dry weight, 43.645 - 239.115 mg/kg dry weight, 0. 733 - 3.471 mg/kg dry weight and 5.538 - 46.263 % dry weight respectively at all stations. While for sediment, the concentration (mg/kg dry weight) ranged from 0.053 - 0.359 for Cd, 0.479 - 8.481 for Cu, 3.321 - 94.878 for Zn, 0.466 - 3.203 for Pb and 30.038 - 231.394 % dry weight for Fe at all stations in coastal Terengganu. Setiu Wetland showed higher content of metals compare to Marang River and Kerteh River. For heavy metal depuration experiment, the results showed that Crassosstrea sp. was able to depurate heavy metal more effectively. The concentration of Cd in oyster has decreased 32.58% from day Oto day 7, Cu decreased 36.91%, Pb decreased 66.95% and Fe decrease 54.79%. However, the concentration of Zn increase 18.45% from day Oto 7.