Interspecific Variation of Heavy Metal Concentrations in the Different Parts of Tropical Intertidal Bivalves

Abstract

The concentrations of Cd, Cu, Fe, Ni, Pb and Zn in the different parts of six bivalves species were determined. From the study conducted, it was found that the byssus of Perna viridis, Scpharca broughtonii and Trisidos kiyonoi; the gill of Polymesoda erosa and Donax faba; and the foot of Gelonia expansa were highly accumulative of Cu. High levels of Cd were found in the gills of Scpharca broughtonii and the byssus of Trisidos kiyonoi; and also the shells of the four remaining bivalve species. As for Zn, the mantles of P. erosa and T. kiyonoi, and the gills of D. faba, G. expansa and S. broughtonii were highly accumulative of Zn. High level of Pb and Ni were found in the shells of all the species which indicated that the shells of the bivalves were highly accumulative of Pb and Ni. Elevated levels of Fe however were found in the different parts of the bivalve since Fe is an essential metal in metabolic activities and an abundant element in nature. The heavy metals in the total tissues and the different soft tissues of the bivalves were compared with the maximum permissible limits set by five different countries. From the comparison, it was found that most of the bivalves contained metal concentrations which were below the maximum permissible limits and should pose no toxicological risk to consumers.

Facile synthesis of AgNPs on reduced graphene oxide for highly sensitive simultaneous detection of heavy metal ions

“…The polished MGCE was washed with HNO 3 (1 : 1), absolute ethylene, and deionized water to reduce the amount of adsorbed substances on the surface of the electrode, and then dried at room temperature. Then, 1 mg of AgNPs/RGO nanocomposite powder was dispersed in 2 mL of alcohol.…”

Comparative study of the metal accumulation in Hysterothalycium reliquens (nematode) and Paraphilometroides nemipteri (nematode) as compared with their doubly infected host, Nemipterus peronii (Notched threadfin bream)

“…The use of bioindicators to study the heavy metals pollution in the Malaysian environment has received widespread attention; shellfish, which includes bivalves, gastropods, and crustaceans, have been used in bioaccumulation metals studies (Franklin and Edward 2009; Mokhtar 2009). Fish parasites, as models in studies of heavy metals and pollutant accumulations, have never been taken into account for biomonitoring in the South China Sea.…”

Bioconcentration of Cadmium and Nickel in Mud Clams (Polymesoda expansa) at Sungai Balok, Pahang

“…The data obtained in this study were compared with the previous investigations on the same species but from different locations in Malaysia such as Kuala Perlis [16], Pasir Putih [17] and Sarawak [18].…”