Heavy metal pollution levels in water and oysters, Saccostrea cucullata, from Mzinga Creek and Ras Dege mangrove ecosystems, Tanzania

摘要: Heavy metal (cadmium, chromium, copper, mercury, lead and zinc) concentrations in mangrove forests were investigated water, suspended particulate matter (SPM) oyster samples from the Mzinga Creek Ras Dege stands, Tanzania, using Inductively Coupled Plasma–Atomic Emission Spectroscopy. With exception of Zn, dissolved metals generally less than 1μg l–1 all samples. Higher recorded SPM forest, on ebb tides during rainy season. Concentrations Cd ranged 33.9–85.5μg g–1 dw and, for Cr, 23.9–138.1μg dw. The concentration Pb 56.5–114.0μg Zn was 35 times higher that Dege, with ranges between 229.8 1 427.3μg In Cd, Cu lower those Creek. Metal oysters an...