中文摘要：

[目的]为污染土壤的控制和修复治理提供科学依据。[方法]以沈阳某冶炼厂废旧厂区土壤为研究对象,采用连续浸提-形态分析法对汞形态进行分析,并以几种无机盐离子作浸提剂,研究不同离子浓度对污染土壤中汞的释放情况。[结果]土壤样品中汞主要以残渣态或晶格态存在,占87.40%,其次是难氧化降解有机质及某些硫化物结合态。随着SO42-和Cl-浓度的增加,汞的释放量逐渐增大。CO32-浓度大于50mmol/L对Hg的释放能力随浓度的增加而增强。OH-对汞的释放能力最弱。土壤中汞的释放量随着Na^＋、Ca^2＋浓度的增加而增大,但释放率都不足总量的3%。随着HCl浓度的增大,汞的释放率增大,达56.56%。[结论]该土壤样品中汞主要以残渣态或晶格态存在。不同阴离子在不同的浓度范围内对Hg的释放能力不同。强酸条件能大大增强汞的溶出毒性。

英文摘要：

Objective the aim of this study to provide scientific base for control and remediation and treatment of soil pollution.Method With the soil sampled from the a deposed smelt factory＇s region in Shenyang as tested soil the soil mercury species were analyzed by sequential extraction species method.With several familiar inorganic salt ions as extracting agent the mercury release from the contaminated soil by the ions with different concentration was studied.Result Mercury in the soil samples existed in form of residue or crystal lattice mainly,accounting for 87.40%,followed by hardly degraded oxidation and degradation organic matter and some bound-state sulfide.The mercury releasing amount enhanced with the increment of SO42-and Cl-.CO32-at over 50 mmol/L increased the releasing ability on Hg with its concentration.OH-was most weak in the releasing ability on Hg.The mercury releasing amount in the soil enhanced with the increment of Na＋ and Ca2＋,but its releasing rate was below 3 % of total amount.The mercury releasing rate increased with the increment of HCl,up to 56.56 %.Conclusion Mercury in the soil samples existed mainly in form of residue or crystal lattice.Different ions at different concentration range had different releasing ability.The strong acid condition could enhance the dissolved toxicity of mercury.