中文摘要：

利用优化Tessier连续化学浸提法对贵州万山汞矿区污染土壤中汞的形态分布进行研究。结果表明,稻田土壤中汞主要以残渣态形式存在（79.65%）,其次为有机结合态（19.97%）、氧化态（0.31%）、特殊吸附态（0.04%）和溶解态与可交换态（0.03%）;除特殊吸附态外,其他各形态汞含量均随距污染源距离增加而降低,特殊吸附态汞在分析土壤中含量变化不明显;生物可利用性（溶解态与可交换态和特殊吸附态）汞占总汞比例较低,但在污染土壤中其含量明显高于未受污染地区。

英文摘要：

The optimized Tessier sequential extraction procedure（SEP） method was used to analyze the speciation and bioavailability of mercury（Hg） in pollution soils of Wanshan mercury mining area,Guizhou Province.The results indicated that the concentration of Hg in rice paddies was dominated by residual fraction（79.65%）,followed by organic bound fraction（19.97%）,oxide bound fraction（0.31%）,specifically sorbed fraction（0.04%） and exchangeable fraction（0.03%）.The content of mercury species in soil samples were found to decrease with distance increasing from pollution sources,except specifically sorbed fraction;the proportion of bioavailable（exchangeable fraction and specifically sorbed fraction） mercury was very low in contaminated area,but the content was obviously higher than those in reference soil.