中文摘要：

土壤重金属污染问题已经成为环境污染的热点问题。以FeS、Na2S、黄铁矿、CaO、黄铁矿＋CaO作为稳定剂,应用化学稳定化修复技术对贵州万山地区的2种汞污染程度不同的农田土壤（1号土、2号土）进行修复,并研究稳定剂用量、稳定时间等因素对稳定效率的影响,确定最佳稳定条件。结果显示：在FeS、Na2S、黄铁矿、CaO、黄铁矿＋CaO这5种稳定剂中Aa_2S的稳定效果最好,对2种土的稳定效率均高达90%左右;对于1号土,最佳稳定条件为：稳定剂Na2S,稳定时间7d,稳定剂用量S：Hg=1。对于2号土,最佳稳定条件为：稳定剂Na2S,稳定时间7 d,稳定剂用量S：Hg=5。Na2S作为稳定剂通过改变汞在土壤中的形态分布降低污染土壤中汞的浸出毒性。

英文摘要：

Heavy metal contamination of soils has become a serious environmental issue.In this study,a chemical stabilization technique was adopted to remediate two kinds of farmland soil with different degrees of mercury pollution,sampled in the Wanshan District of Guizhou Province,with 5 different stabilizers（FeS,Na2S,iron pyrite,CaO,iron pyrite ＋ CaO）.The effects of stabilizer addition and stabilizing duration on stabilization efficiency were studied.The optimal stabilization conditions were also explored.Results showed that Na2S was the most effective among the 5 stabilizers,and its stabilization efficiency for both kinds of farmland soil was greater than 90%.For the first type of soil,the best stabilization was observed with Na2S as the stabilizer,with a stabilizing duration of 7 days and stabilizer dosage of S：Hg=1.For the second type of soil,the best stabilization was observed with Na2S as the stabilizer,with a stabilizing duration of 7 days and stabilizer dosage of S：Hg=5.Na2S as the stabilizer reduced the leaching toxicity of contaminated soil by altering the mercury species distribution in the soil.