Studi Kandungan Logam Berat Timbal (Pb) dan Tembaga (Cu) di Perairan Danau Toba, Provinsi Sumatera Utara

Abstract

Utilization of Lake Toba is very diverse and required water quality and fulled certain requirements. Otherwise, the used of the lake for the various activities of the society also gives impact to water quality degradation. This research has been conducted in May to July 2013 in Lake Toba. This research used Purpossive Random Sampling. There are 3 locations. Station 1: Ajibata as the inlet region of Lake Toba, Station 2: Haranggaol as Keramba cage area and Station 3: Porsea as the outlet of Lake Toba. Sampling activities were conducted once/month. This research aim to know heavy metal consentrate of Lead (Pb) and Copper (Cu) in waters and sediments. The results showed that the average water quality of Lake Toba is still in the normal range. Metal content of Lead (Pb) and Copper (Cu) concentration in the water column showed 0,028 mg/l and 0,027 mg/l. Another it, the results of the study indicate that in the sedimen, concentrate of metal heavy Lead and Copper respectively at 3,161 mg/kg and 2, 142 mg/kg. These results indicate that the water had been polluted from the water measurement while the sediments hadn’t been contaminated.