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| A comprehensive discussion on the geochemical characteristics and threatening indexes of the marine area around Qiansan Island, Lianyungang,Jiangsu Province |
| LIANG Sheng-Yue, LIU Jian-Dong, GUO Bing-Yue, XU Ming-Zuan, QI Chao, JIN Zhi-Peng |
| Geological Exploration Technology Institute of Jiangsu Province,Nanjing 210049,China |
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Abstract Geochemical distribution characteristics of 26 geochemical indexes were studied based on the geochemical survey of submarine sediments and seawater in Qiansan Island,Lianyungang,Jiangsu Province.The results show that the evaluating results of most indexes are well-distributed and close to corresponding background values,and the quality of submarine sediments and seawater is good;nevertheless,a few locations of the sea area exhibit relatively high evaluating values of different indexes,some of them have the potential environmental risk,and a few of the heavy metals exceed the environmental standards. On such a basis,3 risky areas (blocks or locations) and some potential risky locations were preliminarily delineated,and risky indexes such as As and Pb and some other potential risky indexes containing Cd,Ba,MnO were successfully determined.The qualities of the sediments in this area are classified into 3 levels,i.e.,clear level,sub-clear level and weakly contaminated level.The original source and evolutionary trends of some risky and potential risky indexes such as As,Pb and Ba are tentatively discussed with the purpose of providing some preliminary models or recommended plans for prompting the future construction and other activities in the coastal area of Jiangsu Province.
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Received: 12 October 2016
Published: 20 October 2017
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