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湖泊科学  2003 

武汉东湖沉积物中重金属生物有效性研究

DOI: 10.18307/2003.0414

Keywords: 酸挥发性硫化物,同步提取金属,生物有效性,深度分布,沉积物.

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Abstract:

沉积物中的酸挥发性硫化物(AVS)是预测厌氧沉积物中重金属生物有效性的重要参数,SEM/AVS大于1时沉积物中重金属具有潜在生物毒性,小于1时则无生物有效性.本文研究了东湖三个不同污染负荷的站点的同步提取金属SEM(Cu,Zn,Pb,Cd,Ni,Co,Ag,Cr)和SEM/AVS的深度分布,研究表明东湖沉积物中主要重金属是Zn,Cr和Cu,约占SEM总量的90%.I站、Ⅱ站沉积物中AVS是重金属生物有效性的主控因子之一,对重金属的深度分布影响较大,重金属不具有生物有效性;Ⅲ站沉积物中AVS对重金属的深度分布影响较小,重金属具有潜在的生物毒性.相关分析表明,I站、Ⅱ站沉积物中Cr、Ni、Ag、Cd与AVS在P<0.05有显著性相关,AVS对这些金属的深度分布具有更强的控制作用;虽然两站沉积物中Cr的含量差别不大,东湖I站沉积物中Cr/AVS比值(0.02)显著高于Ⅱ站(0.003),沉积物中Cr与硫化物的结合主要是受还原反应的影响.

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