腐殖酸对污染土壤中铊赋存形态的影响  

EFFECT OF HUMIC ACID ON SPECIATION TRANSFORMATION OF THALLIUM IN POLLUTED SOILS

作　　者：邓红梅[1,2] 陈永亨[1] 

机构地区：[1]广州大学环境科学与工程学院,广州510006 [2]广州市污染控制与同位素应用重点实验室,广州510006

出　　处：《环境化学》2010年第1期35-38,共4页Environmental Chemistry

基　　金：国家自然科学基金(40803026);NSFC-广东省联合基金重点项目(U0633001);广东省博士启动基金(8451009101001023);广州市属高校科技计划项目(08C079)

摘　　要：通过实验室土壤培养实验,研究腐殖酸对土壤中铊形态转化的影响.结果表明:添加腐殖酸后,铊的酸可交换比重由30.51%下降到13.57%;铊的Fe/Mn氧化物结合比重由3.7%增加到10.96%;铊的有机质结合态比重由0.67%增加到11.08%;铊的残余态比重几乎无变化.随着腐殖酸用量增多,可促进土壤铊酸可交换态向Fe/Mn氧化物结合态和有机质结合态转化,降低重金属的可迁移性和生物可利用性.说明腐殖酸可以固定土壤中的铊,其作用机制在于腐殖酸具备的络合(螯合)能力和胶体特性.An indoor soil column cultivation experiment was carried out to investigate the effect of humic acid on transformation of thallium.After adding humic acid,the results showed that humic acid could reduce significantly the exchangeable-Tl from 30.51% to 13.57% and increase the percentage of Fe-Mn oxide fraction and organic form of Tl significantly from 3.70% to 10.96% and 0.67% to 11.08%,respectively;however,the content of residual-Tl appeared no variations.The increase of humic acid dosage can make it easier that exchangeable-Tl form is changed to Fe-Mn oxide fraction and organic form of Tl.The transformation and bioavailability of Tl also decreased.It indicats that humic acid could immobilize Tl in soil.The mechanism is due to the ability of coordinetion and colloidal characteristics of humic acid.Humid acid is a good materia1 for soi1 remediation.

关 键 词：铊 腐殖酸 形态 生物可利用性 

分 类 号：X533[环境科学与工程—环境工程]