不同水分条件下汞在土壤中形态转化的研究  

Dynamic Process of the form of Mercury in the Soil under Different Water Conditions

作　　者：依艳丽[1] 李迎[1] 张大庚[1] 刘珊珊[1] 赵鸣镝[1] 

机构地区：[1]沈阳农业大学土地与环境学院/辽宁省农业资源与环境重点实验室,沈阳110866

出　　处：《沈阳农业大学学报》2010年第1期42-45,共4页Journal of Shenyang Agricultural University

基　　金：沈阳市科学技术局项目(2007GX-01)

摘　　要：为探求汞污染土壤的有效治理途径,通过室内模拟试验研究不同土壤水分条件下,外源汞进入到土壤中的形态随时间的变化规律。利用连续提取的方法进行汞形态分析,结果表明:水溶态汞含量在培养初期迅速下降,后来逐渐变慢并趋于平稳,在20%、70%的含水量处理下随培养时间的增加,水溶态汞含量的变化幅度分别为0.96～0.12mg·kg-1和1.09～0.05mg·kg-1;淹水处理下水溶态汞下降较快,变化幅度为0.77～0.02mg·kg-1。酸溶态汞含量在20%、70%含水量下随培养时间的增加呈上升趋势,变化幅度分别为0.94～1.18mg·kg-1和0.98～1.36mg·kg-1,而在淹水下含量逐渐降低,由原来的1.34mg kg-1减少到0.96mg·kg-1。碱溶态汞在30d内较快增加,而后趋于平衡,3种含水量处理下的变化幅度为1.28～2.23mg·kg-1、1.69～2.43mg·kg-1和1.76～2.25mg.kg-1。惰性汞随培养时间的增加呈现逐渐增加的趋势,3种含水量处理下的变化幅度为3.47～5.70mg·kg-1、4.34～6.14mg·kg-1和4.53～6.47mg·kg-1。可见,外源汞进入土壤后的不同形态汞含量为惰性汞>碱溶态汞>酸溶态汞>水溶性汞,并且随时间的延长,后3种形态的汞逐渐向惰性汞转化。In order to seek the effective way to control soil polluted by mercury,the indoor simulated test was carried out to study the effect of the water on the forms of exchangeable mercury in the soil.Under 20% and 70% of field capacity,the exchang eable mercury increased with culture time ranging 0.96～0.12mg·kg^-1 and 1.09～0.05mg·kg^-1.Compared to that under 20% and 70% of field capacity,soluble mercury under the flooded water declined rapidly,ranging from 0.77 ～0.02mg·kg^-1.Acid-soluble mercury in 20% and 70% of field capacity under the upward trend,Ranging of 0.94～1.18mg·kg^-1,0.98～1.36mg·kg^-1.Acid-soluble mercury content decreased in flooded water from 1.34mg·kg^-1 to 0.96mg.kg^-1.Alkalisoluble mercury increased in first 30 days of incubation,and then tended to be invariable,ranging 1.28～2.23mg.kg^-1,1.69～2.43mg·kg^-1 and 1.76～2.25mg·kg^-1.Residue of mercury increased with the incubation time of a growing,ranging 3.47～5.70mg.kg^-1,4.34～6.14mg·kg^-1,4.53～6.47mg·kg^-1.The results showed that the added mercury into the soil,the distribution of mercury is inert mercury alkali soluble mercuryacid-soluble mercurywater-soluble mercury and the extension of the time,the three forms of mercury converted into mercury gradually inert.

关 键 词：含水量 土壤汞 形态 

分 类 号：X502[环境科学与工程—环境工程] X53