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| Evaluation of heavy metals pollution in surface sediments of the intertidal Jiaozhou Bay, China |
| LIU Zhao-qing1,2, XU Fang-jian1,2,3, TIAN Xu4, XU Feng1, ZHAO Yong-fang3, LI An-chun3, JIANG Zu-zhou1, YIN Xue-bo3 |
1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Evaluation and Detection Technology Laboratory of marine mineral resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
4. National Deep See Center, Qingdao 266237, China |
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Abstract The current study investigated the pollution characteristics of heavy metals (Cu, Pb, Zn, Cr, Cd, As) in sediments of the intertidal Jiaozhou Bay using 29surface sediments by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and discussed the distribution, the source and the pollution extent of heavy metals. The results showed that the average concentrations of Cu, Pb, Zn, Cr, Cd, and As were 38.8, 55.2, 107.4, 69.9, 0.44, and 9.2mg/kg, respectively. The level of contamination factor (CF) followed the order:Cd > Pb > Zn > As > Cu > Cr, and the northeast of the studied area were seriously polluted by heavy metals. Pollution load index (PLI) indicated that 72.4% of the stations were polluted, and the regional pollution load index (PLIzone) reflected that the intertidal zone was moderate pollution. The monomial potential ecological risk index (Eri) were in the following order:Cd > Pb > Cu > As > Zn > Cr. The potential ecological risk index (RI) revealed that the ecological risk at low, moderate, high, and very high level were 51.7%, 24.1%, 17.2%, and 7.0%, respectively, and the Cd was the primary potential ecological risk factor. Transportation, agriculture and industrial pollution were the main sources of heavy metals. Therefore, emergent strategies and artificial regulations should be used to control the sources of heavy metal pollutants in Jiaozhou Bay, especially in the northeast area.
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Received: 08 October 2016
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