期刊论文

中文

水土保持学报

1009-2242

2009

23

3

69-73

10.3321/j.issn:1009-2242.2009.03.016

国家自然科学基金（20677080）,湖南省重点学科建设项目 中南林业科技大学***基金（104-0073）

本校为其他机构

通过实验室浸泡试验,研究了4种酸溶液和2种盐溶液对As污染土壤化学萃取修复的效果及其机理,同时从土壤pH的改变和土壤组分的溶出2个方面研究了化学萃取对土壤的负面影响.结果表明,4种酸溶液中,H_3PO_4对土壤As的去除效果较好.其次是C_6H_8O_7,HCl和HClO_4则没有明显效果;2种盐溶液中,KHPO_4的效果较好,NH_4HCO_3的效果不理想.5～200 mmol/L的H_2PO_4和KH_2PO_4对土壤As的去除率分别为7.76%～22.85%,6.81%～20.21%.H_3PO_4对土壤As的去除是风化溶解土壤组分带来As的释放与PO_4~(3-)置换土壤As这2种机理共同作用的结果.其中PO_~(3-)4发挥了主要的作用;KH_2PO_4对土壤As的去除则完全归因于PO_4~(3-...

The effects and mechanisms of As removal from contaminated soils using four acid solutions and two salt solutions, and negative effects of these acid and salt solutions on change of soil pH and dissolution of soil components were studied in laboratory batch experiment. The results showed that H3 PO4 proved to be most effective in removing As from contaminated soil among four and solutions, followed by C6 H8 O7, while HCl and HClO4 removed As insignificantly. Among two salt solutions, KH2PO4 presented higher effectively in removing As from soils than NH4 HCO3. Under concentrations of 5-200 mmol...