Distribution patterns and ecological assessment on heavy metals in the surface sediments of Laizhou Bay
ZHENG Yi-min1,2, GAO Mao-sheng1, LIU Sen1,3, ZHAO Jin-ming4, GUO Fei1,5, WANG Chang-ming2
1. The Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;
2. College of Construction Engineering, Jilin University, Changchun 130026, China;
3. Qingdao Institute of Geological Exploration, China Metallurgical Geology Bureau, Qingdao 266061, China;
4. NO.4 Exploration Institute of Geology and Mineral Resources, Weifang 261021, China;
5. School of Geosciences, China University of Petroleum, Qingdao 266555, China
Abstract：This paper, based on the 154 of geochemical data of surface sediments and other geological data, deals with the distribution pattern of heavy metals in the Laizhou Bay, and uses the Nemerow comprehensive index method to evaluate the economical of the region. The results show that, in the surface sediments of the study area, the average contents of Cu, Pb, Zn, Cr, As, Hg, Cd are 21.96×10-6, 21.99×10-6, 60.41×10-6, 60.00×10-6, 12.64×10-6, 0.051×10-6, 0.12×10-6 respectively. The content is relatively higher in the west part of the study area for most heavy metals, which is obviously caused by the land source input form the west and movement rule of tidal current. The Cu, Pb, Zn are mainly derived from the natural weathering and erosion processes of rocks. The Cr, Cd are influenced by both the natural and the anthropogenic sources. The As, Hg are derived chiefly from the anthropogenic sources. The pollution index present the highest value in the waters near the Xiaoqing River estuary, the old Huanghe River subaqueous delta and the Yellow River Estuary. On the Contrary, the pollution index is the lowest in the southeast region of Laizhou Bay. The Nemerow comprehensive index of heavy metal decreases from west to east.
ZHENG Yi-min,GAO Mao-sheng,LIU Sen et al. Distribution patterns and ecological assessment on heavy metals in the surface sediments of Laizhou Bay[J]. Marine Environmental Science, 2015, 34(3): 354-360.
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