象山港重点增养殖区重金属残留量分布及污染源分析

根据2002年6月对象山港重点增养殖区水体中重金属含量的调查,研究象山港水体中重金属残留量、分布及其来源。研究结果表明,象山港水体中重金属铜、铅、锌、镉、总汞、砷、总铬的含量均符合二类海水水质标准,其中铜、镉、砷、总铬的含量很低,符合一类海水水质标准,铅、锌、总汞的含量在一类和二类标准之间。重金属铜、铅、锌、镉在支港黄墩港含量较高,4区(主港)或3区(西沪港)最低,其中锌以港口及其延伸的主港区含量最高;汞、砷、铬则在4区及其邻近分区含量较高。象山港水体中的重金属含量在东海10个重点河口港湾中)属于偏高,近5年来水体中铜、汞和砷含量波动大,其它重金属含量稳中有升。象山港水体中的重金属来源于自然和人为活动两部分,前者主要来源于象山港汇水区土壤和矿物中的重金属,后者为周边各汇水区电镀、化工等乡镇企业的污水汇入。

The distribution and source of heavy metals in an important aquaculture sea area Xiangshan Bay

The content, distribution and source of heavy metals were researched based on the results of investigation in Xiangshan Port in June 2002.The content of copper, cadmium, arsenic and chromium was consistent with the first level of sea water quality criterion,of which other three heavy metals (lead、zinc、mercury) were relatively high but also consistent with the second level of national sea water quality criterion and mariculture environment criterion for safe seafood. The distribution of heavy metals was not even, the content of copper, cadmium and zinc was high in Huangdun Port for the cause of the high background on sediment and soil where the mine is abundant in zinc and lead. Compared with other 10 important bays or estuaries in the East China Sea, the content of heavy metals in Xiangshan Port was relatively high. In recent 5 years, most of the heavy metals have risen slightly and kept stable but the content of copper, mercury and arsenic has fluctuated visibly. The sources of heavy metal are from nature and industrial pollution,with the former being affected by mine.