近江牡蛎对Pb的累积和排出

Accumulation and elimination of Crassostrea rivularis to lead

采用更新式在自然光照和窒温条件下进行了近江牡蛎Ｃｒａｓｓｏｓｔｒｅａｒｉｖｕｌａｒｉｓ对Ｐｂ的累积和排出试验。近江牡蛎对海水中Ｐｂ的累积是净累积型，其体内的Ｐｂ含量与海水的Ｐｂ浓度之间呈显著的线性正相关（Ｐ＜０．０１），近江牡蛎体内的Ｐｂ含量与暴露时间之间呈显著的线性正相关（Ｐ＜０．０１），Ｐｂ从近江牡蛎体内排出的生物学半衰期为１４ｄ，近江牡蛎对Ｐｂ的累积随海水盐度的升高而呈明显的下降趋势，海水盐度的升高有利于近江牡蛎体内残留Ｐｂ的排出。近江牡蛎是比较理想的海洋重金属Ｐｂ污染监测生物。

The results from the study on accumulation and elimination of Crassostrea rivularis tolead are as follows: the pattern of lead taken up by Crassostrea rivularis was net accumulation.Lead was linearly accumulated by Crassostrea rivularis in proportion to ambient metal concentra-tions up to 316 μg/L over 10 d. The metal was continuously accumulated of Crassostrea rivularisin the tissues throught exposure, and correlations of the regression line (P<0.01) indicate thataccumulation is linear with time. Loss of lead from Crassostrea rivularis was rapid, and its bio-logical half-life was 14d. Decreasing in accumulation of lead by crassostrea rivularis was significantwith increasing salinity. Increasing salinity in water is of benefit to loss of lead from Crassostrearivularis tissues. As a result, this oyster is a reliable for the biomonitor of lead pollution in seawater.