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2002年10月江苏省如东洋口文蛤大面积死亡。作者对现场采集的死烂文蛤、近岸海水、滩涂底质3类样品进行检测,并与苴镇、东凌、吕四样品对比分析。发现:(1)洋口死烂文蛤体内有害重金属Cr、Pb、Zn、Cd、As含量比另3处高出数十倍;(2)事发时洋口近岸海水水质与其他水域比较,Zn偏高20倍以上,Cr偏高10倍以上,As亦偏高;(3)洋口滩涂底质中有害重金属含量已接近污染上限。
In October 2002, a large area of mouth clam in Jiangsu Province died. The authors collected three kinds of samples of dead clam, coastal seawater and tidal flat collected from the field, and compared them with the samples of Jiaocheng, Dongling and Lu-si. The results showed that: (1) Cr, Pb, Zn, Cd and As concentrations in harmful clam of Yangkoukou were higher than those of the other three by several times; (2) Compared with other waters, Zn is more than 20 times higher, Cr is more than 10 times higher, and As is also higher; (3) The harmful heavy metal content in the sediment of Yangkou beach is close to the upper limit of pollution.