深圳市潮间带动物体内的重金属含量

Contents of heavy metals in marine animals along intertidal zone at Shenzhen

2005年12月和2006年5月调查了深圳海岸潮间带动物体内的重金属含量。结果表明,动物体内重金属Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Se、Mo、Pb、Cd、Sn、Sb、Ba和Hg的平均含量分别为0.63、9.24、137.22、0.13、1.46、97.36、283.77、1.96、0.49、0.27、0.68、0.62、0.28、0.01、1.23和0.01mg.kg-1(湿重)。采用中国海岸带污染综合调查技术组推荐使用的海洋生物污染评价标准以及贾晓平等提出的污染评价标准参考值,结果表明深圳潮间带软体动物体内的Cu、Zn超标较为严重,其中牡蛎的Cu、Zn超幅分别达到5.27和9.05倍。所有样品中的Cr、Ni、Pb和Hg都没有超标,而As则全部超过人类食用限量标准,部分样品如疣荔枝螺Thais clavigera的超幅达5.63倍。分析表明,深圳市潮间带软体动物Cu含量超标源自珠江口、深圳湾及大鹏湾海水中的Cu超标,而所调查动物中Zn和As的超标原因有待进一步研究。

Heavy metal contents have been investigated for the marine animals along the intertidal zone at Shenzhen in December 2005 and May 2006. As a result, the average contents of Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Mo, Pb, Cd, Sn, Sb, Ba and Hg were 0. 63, 9.24, 137.22, 0.13, 1.46, 97.36, 283.77, 1.96, 0.49, 0.27, 0.68, 0.62, 0.28, 0.01, 1.23 and 0.01 mg·kg^-1（wet weight）, respectively. The contents of Cu and Zn in the mollusks were higher than the evaluation standard of heavy metal pollution for the marine animals. Among them, the contents of Cu and Zn in the oysters were 5.27 and 9.05 times of the limit standard respectively. The contents of Cr, Ni, Pb and Hg in the mollusk did not exceed the above standard. The content of As in the most investigated animals exceeded the limit standard for human consumption. The highest content of As in Thais clavigera was 5.63 times of limit standard for human consumption. The higher Cu content is a result of Cu contamination in the seawater of Dapeng Bay, Shenzhen Bay and the Zhujiang River estuary, while the causations of higher Zn and As contents in the investigated animals still need to be ascertained in the further study.