小分子有机酸对蛇纹岩发育土壤Ni、Co的活化影响  

The influence of small molecular organic acid on the activity of Ni and Co in serpentine rock growth soils

作　　者：方晓航[1] 仇荣亮[1] 刘雯[1] 汤叶涛[1] 

机构地区：[1]中山大学环境科学与工程学院,广东广州510275

出　　处：《中国环境科学》2005年第5期618-621,共4页China Environmental Science

基　　金：国家"863"项目(2001-AA-640501-03);国家自然科学基金资助项目(20177035);广东省重大科技专项项目(2004A30308002)

摘　　要：研究了不同浓度的柠檬酸、草酸、苹果酸对蛇纹岩发育土壤镍(Ni)、钴(Co)的活化效果.结果表明,在较低浓度(<10mmol/L)时,3种有机酸对土壤中的Ni、Co活化效果均较差.柠檬酸对元江、墨江土壤Ni的最大活化比例分别为9.1%、12.9%,远大于其他2种有机酸(P<0.05).各有机酸活化能力的大小为柠檬酸>草酸>苹果酸,同时Ni、Co活化量之间存在一定的相关性.基于结合率与Ni、Co活化量的考虑,在蛇纹岩发育土壤的化学修复或螯合诱导植物修复中,10～30mmol/L的有机酸是较为适合的浓度.草酸在50mmol/L时,对Ni、Co的活化效果有所降低.The activity effect of citric acid, oxalic acid and malic acid of different concentration on Ni and Co in serpentine rock growth soils was studied. The activity effect of Ni and Co in soil by 3 kinds of organic acid was worse at lower concentration （〈10mmol/L）. The maximal activity ratio of citric acid on Yuanjiang and Mojiang soils was 9.1% and 12.9%, respectively, much greater than the other two kinds of organic acid （P〈0.05）. The size of activation capacity of each organic acid was citric acid 〉oxalic acid〉malic acid. Meanwhile, there existed definite relativity between the activities of Ni and Co. Based on considering the combing rate and the Ni, Co activity weights, the relatively adopted concentration of organic acid was 10-30mmol/L in the chemical restoration of serpentine rock growth soil or the chelateinduced plant-restoration. The activity effect of Ni, Co by oxalic acid reduced somewhat at high concentration （50mmol/L）, due to the formation of precipitates.

关 键 词：小分子有机酸 蛇纹岩发育土壤 镍 钴 活化 

分 类 号：X54[环境科学与工程—环境工程]