Analisis Logam Berat (Pb dan Cd) yang Terakumulasi pada Eceng Gondok (Eichornia Crassipes Solms.) di Sungai Asahan, Kabupaten Toba Samosir

Abstract

The research on analysis ofhavy metals (Pb and Cd) accumulated in the water Hyacinth (Eichornia crassipesSolms.) in the Asahan river, Subdistrict Toba Samosir has done in June 2013. Sampling was done by purposive random sampling to determine the three observation stations. Samples taken included roots, stems, leaves of hyacinth, sediment and water were then analyzed by AAS. The results showed that the levelcontamination in the river of Asahan river by heavy metal (Pb and Cd) was still below the water quality standards (PP No. 82, 2001), Pb concentrations is less than 0.03 mg/l and Cd is less than 0.01 mg/l. Plumbum and Cadmium concentrations in aquatic sediments is still relatively safe for life. The results analysis on the roots, stems and leaves of water hyacinth showed that the highest Pb concentration was observed found was in the roots while the lowest one was in the leaves, whereas for Cd was highest on the stems and the lowest on the leaves. Bioconcentration factor value of water hyacinth is abel to accumulate heavy metals (Pb and Cd) in the medium category because of it’s BCF range 250-1000.