Bioaccumulation of cadmium and lead in some biota in Laguna de Bay [Laguna, Philippines]
2001
Perez-Javier, N.G.
Cadmium and lead levels were determined in sediments, water and some biota in the four main bays of Laguna de Bay using FAAS . Results showed that the sediments from all sites were polluted in Cd but not in Pb with the west Bay containing the greatest amounts of the metal. Cadmium was not detected in the overlaying waters but lead was present in levels tolerable for class C waters. The West Bay containing the greatest amounts of the metal. Cadmium was not detected in the overlaying waters but lead was present in levels tolerable for class C waters. The West Bay appeared to be the most contaminated site considering the safety of its biota for human consumption as well as the Cd levels in the sediment. Less polluted areas were the South Bay, followed by the East Bay, and finally the Central Bay. Fish and molluscs species from the West Bay, molluscs from the East Bay, and benthic herbivores from the Central Bay, and mollusc and benthic fishes from the South Bay were no longer safe for human consumption. Species of mollusc (Corbicula manilensis, Vivipara agularia) tend to accumulate the most Cd and Pb, followed by benthic hervibore (Hypothalmichthys nobilis), benthic carnivores (Arius manilensis, Glossogobius girus), mid-water to botton-feeder amnivore (Tilapia mossambica), and plants (Ruppia sp., Enhalus acoroides). Furthermore, the metals tend to concentrate in the inedible portions of the animals. The correlation between metal concentration and size of organism was generally observed the inedible tissues.
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