污泥中的DOM对中国土壤中Cd吸附的影响-中国科学院.PDF

第 22 卷第 3 期 环 　境 　科 　学 　学 　报 Vol. 22 ,No. 3 2002 年 5 月 ACTA SCIENTIAE CIRCUMSTANTIAE May ,2002 ( ) 文章编号 2002 　　　中图分类号:X53 　　　文献标识码 :A 污泥中的 DOM 对中国土壤中 Cd 吸附的影响 Ⅰ. 纬度地带性差异 ( ) 黄泽春 ,陈同斌 ,雷　梅　 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 :研究了中国不同纬度地带土壤中水溶性有机质 DOM 对 Cd 的等温吸附行为影响的差异 ,并进一步探讨其作用机理. 研究结果表明 :在南方酸性土壤中 ,DOM 对 Cd 吸附的影响以促进作用为主;而在北方的中性和碱性土壤中 ,主要表现为抑制 作用. 同一土壤中,DOM 对 A 层土壤中 Cd 吸附的抑制作用大于B 层 ,这与 A 层土壤 TOC 含量较高有关. DOM 的酸碱缓冲作 用和土壤对 DOM 的吸附作用是影响DOM 对 Cd 吸附抑制作用的两个主要因素. ( ) 关键词 :水溶性有机质 DOM ;消化污泥 ;纬度地带性 ;土壤 ;Cd ;吸附 Effect of DOM derived from se wage sludge on Cd adsorption in different soils in China ( Ⅰ) . difference in latitudinal zonal soils ( HUANG Zechun , CHEN Tongbin , LEI Mei 　 Lab. of Environmental Remediation , Institute of Geographic Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing 　100101) Abstract :A series of batch experiments of isotherms adsorption were conducted to compare the impact of DOM on Cd adsorption in several kinds of latitudinal zonal soils in China. It is shown that DOM can enhance the adsorption of Cd in acidic soils and reduce it in alkaline and neutral soils. In same kind of soil , DOM reduce Cd adsorption in A horizon greater than in B horizon , it mainly due to the higher TOC content in A horizon. The pH buffer function of DOM and the adsorption of DOM in soils may be the two dominative factors that could affect the effica cy of DOM on Cd adsorption in soils. Keywords :DOM;soil ;cadmium;adsorption ;digested sewage sludge ;latitudinal