腐殖酸对土壤铅赋存形态的影响  

Effects of humic acid on lead fractions in soil

作　　者：高跃[1] 韩晓凯[1] 李艳辉[2] 关连珠[1] 颜丽[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110161 [2]沈阳市农业检测中心,辽宁沈阳110034

出　　处：《生态环境》2008年第3期1053-1057,共5页Ecology and Environmnet

摘　　要：通过室内培养试验，深入探讨了不同用量腐殖酸，对铅污染土壤中铅各形态的影响。结果表明，腐殖酸各处理均能显著降低土壤中铅的交换态（EX-），碳酸盐结合态（Col-）和铁锰氧化物结合态（FeMn-）的含量，而有机结合态（Ob-）铅和残渣态（Res-）铅的含量则显著提高。施用腐殖酸有效地降低了铅的活性，且影响程度随腐殖酸用量的增加而显著增加；腐殖酸对土壤中铅离子的各形态含量随时间的变化的影响表现为，在培养0-40d期间，随培养时间的延长交换态铅含量无明显变化，残渣态铅含量显著降低，其它三种形态均呈增加趋势；培养40d后，随培养时间的延长各形态的含量均无显著变化。综合考虑认为施入10％质量比的腐殖酸即可显著降低铅的活性，从而可达到较好的修复效果。Effects of humic acid on lead fractions in polluted soil were explored, through the incubation experiment indoor. The results showed that all the humic acid treatments can decrease the contents of EX-Pb, Cob-Pb and FeMn-Pb, but increase the contents of Ob-Pb and Res-Pb remarkably. As the more humic acid added, the more activity of Pb was restrained. The influence within 40 days was that the EX-Pb changed not clearly, while the Res-Pb reduced, and the other three fractions increased at the same time; whereas after 40 days the contents of each fractions did not change obviously as time went by. Comprehensive consideration, 10% humic acid could decrease the activity of Pb prominently, accordingly for a favourable effect.

关 键 词：腐硝酸 土壤 铅 形态 

分 类 号：X131.3[环境科学与工程—环境科学]