Rahmatsyah, Rita Juliani, Nusyirwan
The research of heavy metals spread in shellfish in the coastal area a zone of the high seas and zones of settlements waters in Central Tapanuli has done with the aim of knowing the content of heavy metals of Cu, Cr, Pb with parameters of the river water, sea water, shellfish and clamshell, basic sediments. Testing of river water, sea water, and shell meat was conducted using Atomic Absorption Spectrometer (AAS) by adsorption principle of light by atoms. Testing basic sediment and clamshell has done with XRD and TEM. The test results of river water showed are Cu 0,025 mg/l, Cr 0.006 mg/l - 0.025 mg/l, Pb 0.005 to 0.03 mg/l, in the conditions of under the river water quality standard. The test results on the sea water obtained are metal content of Cu. 0.006 mg/l, Cr 0,025 mg/l, Pb 0.13 to 0.24 mg/l. The test results show the shell meat are Pb. 0.005 to 2.34 mg/kg, Cu 0.85 to 14.4 mg/kg. The test results of clamshell with XRD showed peaks of CaCO3 aragonite. With TEM showed that crystalline, by electron diffraction pattern formed by irregular dot, which means the elements contained in the various clamshells. Differences levels of heavy metals at every point stations predicted has their natural factors such as the direction of ocean currents, rainfall and sediment material and anthropogenic factors such as demographics residential waste pollution, industrial and port activity. © Published under licence by IOP Publishing Ltd.
Department of Physics, State University of Medan, Medan, Indonesia; Department of Physics, Medan of University, Medan, Indonesia; Department of Biology, Medan of University, Medan, Indonesia
