• 关键词：水溶性有机质(DOM)  固体废弃物  土壤  Cd  吸附

• 基金项目：中国科学院知识创新工程重点方向项目(编号:KZCX2401);北京市自然科学基金重大项目(编号:69900O2)

• 陈同斌
• 中国科学院地理科学与资源研究所环境修复实验室,北京 100101

• 黄泽春
• 中国科学院地理科学与资源研究所环境修复实验室,北京 100101

• 陈煌
• 中国科学院地理科学与资源研究所环境修复实验室,北京 100101

• 摘要：通过等温吸附试验研究了5种来自不同固体废弃物的水溶性有机质(DOM)对土壤中Cd吸附行为的影响.研究结果表明:DOM对土壤中Cd吸附行为的影响与土壤类型和DOM种类有关,其影响机理主要是DOM的酸碱缓冲作用和络合作用.酸性土壤中,猪粪DOM对Cd吸附的促进作用最强,而脱水污泥、堆腐污泥、消化污泥、小麦秸杆DOM的促进作用较弱,且差异不大;中性土壤中,各种DOM均抑制Cd的吸附,抑制效果由大到小顺序为:堆腐污泥DOM>消化污泥DOM≈小麦秸杆DOM>脱水污泥DOM>猪粪DOM;碱性土壤中,5种DOM同样表现为对Cd吸附的抑制作用,抑制效果由大到小顺序为:堆腐污泥DOM>消化污泥DOM>脱水污泥DOM≈猪粪DOM>小麦秸杆DOM.

• Abstract：In order to study the effects of DOM on Cd adsorption by soils and its mechanisms, a series of batch experiments of Cd adsorption were conducted to compare the difference between Cd adsorption onto three kinds of soils with and without DOMs. Great diversity was observed among the effect of DOMs extracted from five kinds of organic solid wastes on Cd adsorption which was calculated with the standard molar Gibbs free energy (Δ G Φ).In acidic soil, the DOM extracted from pig manure (PM/DOM) enhanced Cd adsorption more significantly than DOMs extracted from raw sewage sludge (RS/DOM), compost sewage sludge (CS/DOM), digested sewage sludge (DS/DOM) and wheat stalk (WS DOM). In alkaline and neutral soils, all DOMs extracted from the 5 organic wastes reduced the Cd adsorption. The order of ability of inhibiting to Cd adsorption is found as following: CS/DOM>DS/DOM≈WS DOM>RS/DOM>PM/DOM in neutral soils, and CS/DOM>DS/DOM>RS/DOM≈PM/DOM>WS DOM in alkaline soils.

• Key words：soil  DOM  cadmium  adsorption  organic solid waste

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