CONCENTRATION OF HEAVY METAL PLUMBUM (Pb) AND CUPPRUM (Cu) IN SEAWATER AND SEDIMENT OF BATUBARA COASTAL WATERS NORTH SUMATRA PROVINCE

Abstract

This research was conducted on August 2011. Samples of seawater and sediment were collected from Batubara coastal waters, North Sumatra and analyzed for their Pb and Cu concentrations using AAS Perkin Elmer 3110 in Marine Chemistry Laboratory Faculty of Fisheries and Marine Sciences Riau University, Pekanbaru. The results showed that Pb and Cu concentrations in seawater and sediment were higher in station closed to PT Inalum Port (0,82 mg/L and 0,05 mg/L; 13,10 μg/g and 11,24 μg/g) for Pb and Cu in seawater and sediment, respectively than that in other stations. The lowest heavy metal concentration was found in station nearby mangrove area (0,42 mg/L and 0,02; 11,53 μg/g and 6,49 μg/g) for pb and cu in seawater and sediment respectively. Concentrations of Pb and Cu in sediment of Batubara coastal waters were still lower than ERL and ERM values which can be concluded that Batubara coastal waters does not have negative impact to organisms living in the surrounding area.