• 关键词：土壤  底泥  汞  吸附  水溶性有机质(DOM)

• 基金项目：国家自然科学基金项目(No.40673063,40573065)

• 陈春羽
• 西南大学资源环境学院, 重庆 400716

• 王定勇
• 1. 西南大学资源环境学院, 重庆 400716; 2. 重庆市农业资源与环境研究重点实验室, 重庆 400716

• 摘要：以重庆市2种耕作土(黄壤和中性紫色土)及鱼塘底泥为试验材料,分别添加提取自腐殖土的DOM(DOM_h),提取自稻草的DOM(DOM_r)和提取自污泥堆肥的DOM(DOM_s),研究DOM对土壤及底泥中Hg的吸附行为的影响.结果表明,DOM对土壤及底泥中汞的吸附行为均有一定的抑制作用,这种抑制作用与DOM种类和试验材料的性质有关.添加不同来源的DOM,对Hg的抑制作用具体表现为:DOM_h>DOM_r>DOM_s;添加同一种DOM时,对Hg吸附的抑制作用表现为鱼塘底泥>紫色土>黄壤.

• Abstract：Three types of dissolved organic matter (DOM) were extracted from humus soils (DOM_h), rice straw (DOM_r) and compost of sewage sludge (DOM_s). The effect of these DOM_s on Hg adsorption was investigated using three soil types (yellow soil, neutral purple soil and pond sediment). The results showed the presence of DOMcan reduce Hg adsorption in soils and sediment, and the degree of inhibition is dependent on the types of soils and the DOM_s. For the same soil, the inhibition was in the order of DOM_h > DOM_r > DOM_s, while for the same DOMinhibition was in the order of pond sediment > neutral purple soil > yellow soil.

• Key words：soil  pond sediment  mercury  adsorption  dissolved organic matter (DOM)

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