Objective To learn the state of heavy metals pollution in seawater and soils around a coastal industrial area and put forward a comprehesive proposal to reduce environmental pollution, in order to provide scientific basis for establishing prevention and control measures.
Methods The sea offshores in a ore dock, coal dock, oil dock and bulk cargo dock were selected as water monitoring points. A sea offshore in a pre-developing spare area was selected as control.Water samples in shallow and deep were collected in monitoring points and the control area. An iron and steel industrial, power plant, ore dock, coal dock and oil dock were selected as soil monitoring points. A pre-developing spare area was selected as control. Surface soil was collected in the monitoring points and the control area.The concentrations of As, Cu, Hg, Zn, Cr, Cd, Ni, Pb were determined by inductively coupled plasma mass spectrometry (ICP-MS).The contamination situation of the monitoring points were evaluated by calculating single factor pollution index (PI)and integrated pollution index (IPI).
Results In shallow water, the single factor pollution index of Cu in all monitoring points and Hg in ore dock were higher than 1. In deep water, the single factor pollution index of both Cu and Hg were higher than 1. It indicated that the seawater was mainly polluted by Cu and Hg.The assessment of integrated environmental quality index showed that all the monitoring points of seawater were slightly polluted.The integrated environmental index of shallow water in oil dock was 1.40, and it was higher than the others. The integrated environmental index of deep water in ore dock was 1.45, and it was higer than the others. The integrated environmental index of deep water in control plot was 1.10, and it was lower than others.The single factor pollution index of soil was lower than 1 suggesting that the concentrations of 8 heavy metals in all monitoring points were lower than the standards. The soils of the iron and steel industrial, power plant and coal docks were lightly polluted and the integrated environmental index were 1.52, 1.46 and 1.44 respectively. The soils of oil docks were not polluted and the integrated environmental index was 0.92. The soils of ore dock and the control plot were clean.
Conclusion The seawater of monitoring points were polluted slightly.The soils of monitoring points were not polluted.
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