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湖泊科学  2006 

季节性缺氧水库甲基汞的产生及其对下游水体的影响

DOI: 10.18307/2006.0602

Keywords: 红枫湖,下游水体,甲基汞,溶解氧,时空分布

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Abstract:

本文采用蒸馏-乙基化结合GC-CVAFS法对贵州红枫湖水库及其各入库和出库河流中的甲基汞时空分布和控制因素进行了研究.在春、秋、冬季节总甲基汞浓度和分布无明显时空变化,在0.053-0.333ng/L之间.春季河流是水库甲基汞一个重要的输入源.夏季水库下层甲基汞显著升高,缺氧层最高值达0.923ng/L.同时发现.缺氧层升高的甲基汞主要来自于水体自己产生或上层水体甲基汞的沉降,而不是来自于沉积物的释放.各季节湖水和河流样品的总甲基汞和溶解氧存在显著的负相关关系,Personal相关系数r为-0.81(n=78).在春、秋、冬季节溶解态甲基汞比例略低于颗粒态甲基汞,但在夏季,特别是缺氧层,甲基汞主要以溶解态存在.夏季河流入水经水库蓄水后,到再流出时已经富含甲基汞,出库河流中总甲基汞浓度已达到各入湖河流总甲基汞平均值的5.5倍,很明显在复季红枫湖已成为下游水体甲基汞的输入源,必将会对下游生态系统产生一定影响.

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