Land use change detection of Kuala Terengganu

Abstract

A study was carried out to determine the concentration of heavy metals (Cu, Zn, Mn, Fe, Cd, Pb) in the molluscs tissues and sediment collected from three stations at Sabak Bernam, Selangor. There are three stations which are located at river, estuary and beach. 5 species of molluscs is collected which is Nerita lineata, Cronia margariticola, Cerithidea obtusa, Batillaria zonalis and Anadara granosa. The concentration of heavy metals is analysis by using Flame Atomic Absorption Spectrometry (AAS). From the studies, it is known that obviously high concentration of Fe (34220.00 ± 226.27 mg/kg) and Pb (7.83 ± 0.87 mg/kg) in the sediments compare with gastropod tissues. While high mean concentration of Cu (116.15 ± 1.061 mg/kg) and Zn (175.35 ± 7.30 mg/kg) found in the gastropods tissues than sediments. There are high concentration of heavy metals contain in Cerithidea obtusa which is one of the edible gastropods especially Cu (116.15 ± 1.061 mg/kg) , Zn (103.12 ± 9.09 mg/kg) and Mn (1417.00 ± 80.61 mg/kg). Anadara granosa is collected from restaurant and factory near by the cockles farming area. It shown that mean concentration of heavy metals in decrease order is Fe>Mn>Zn>Cu>Pb>Cd. There are no significant different between the mean concentration of heavy metals of Anadara granosa from restaurant and Anadara granosa from factory Some of the gastropods have exceed the safety limits by Malaysian Food Regulation 1985 such as Cerithidea obtusa and Cronia margariticola. Even though concentration of heavy metals of cockles still in the safety level given, but it also contain quite high of heavy metals that nearly reaches the safety limit, thus consumer still need to pay concern on this.