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依据2003～2008年6 a间所获得的胶州湾外海洋倾倒区沉积物重金属(Cr、Hg、Cd、Pb、Zn、Cu)的调查数据,重点分析了2007年8月倾倒区重金属的分布特征和影响因素,并对重金属的潜在生态风险及6 a的年际变化趋势进行了初步的分析评价.结果表明,2007年8月调查海域沉积物表层中Cr、Hg、Cd、Pb、Zn、Cu的平均浓度(干重)分别为29.47、0.065、0.105、1.145、9.63、3.355μg/g.除Cr之外,表层沉积物中重金属的分布均呈现出倾倒区内含量高、倾倒区外部含量低的分布特征,这说明疏浚物的倾倒是该海区重金属污染的主要来源.有机碳与重金属(Cr除外)关系密切,二者呈一定的正相关关系.2007年倾倒区表层沉积物中重金属除Hg具有中等潜在生态风险外,其它均为低潜在生态风险,风险指数低于40.6 a间,该倾倒区沉积物中各种重金属含量(Hg除外)在小范围内波动并呈一定的下降趋势,重金属总体生态风险程度处于低潜在生态风险,这从重金属角度说明倾倒区沉积物质量良好.
Based on the survey data of heavy metals (Cr, Hg, Cd, Pb, Zn, Cu) in the marine dumping area outside Jiaozhou Bay obtained from 2003 to 2008, the distribution characteristics of heavy metals in the dumping area in August 2007 are mainly analyzed And the influencing factors, and the potential ecological risk of heavy metals and the interannual variation trend of 6 years were analyzed and evaluated. The results show that in August 2007, the contents of Cr, Hg, Cd, Pb, Zn, Cu (Dry weight) were 29.47,0.065,0.105,1.145,9.63,3.355μg / g, respectively.In addition to Cr, the distribution of heavy metals in surface sediments showed high content in the dumping area, low content in the dumping area , Indicating that dumping dredged material is the main source of heavy metal pollution in the sea area.Carbon and heavy metals (except Cr) are closely related to each other, and there is a certain positive correlation between the two.In 2007, heavy metals in surface sediments except for Hg All of them were low potential ecological risk, and the risk index was below 40.6 a. The contents of heavy metals (excluding Hg) in the sediment of the dumping area fluctuated within a small range with a certain downward trend. The contents of heavy metals Overall students The degree of risk in the low potential ecological risk, indicating good quality deposits of heavy metals from the perspective of the dumping area.