水溶性有机质对土壤中镉吸附行为的影响

应用生态学报 ›› 2002, Vol. ›› Issue (2): 183-186.

水溶性有机质对土壤中镉吸附行为的影响

陈同斌¹, 陈志军²

1. 中国科学院地理科学与资源研究所环境修复室, 北京 100101;
2. 广西科学院情报研究所, 南宁 530022

收稿日期:2001-07-19 修回日期:2001-08-09 出版日期:2002-02-15
通讯作者: 陈同斌,男,1963年生,博士,研究员,博士生导师,主要从事污染土壤的生物修复、土壤环境化学和固体废弃物资源化技术研究,发表论文90余篇、论著8册.E-mail:chentb@igsnrr.ac.cn.
基金资助:
国家自然科学基金资助项目(49671003);北京市自然科学基金重大项目(6990002);中国科学院知识创新工程重点方向项目(KZCX2401)

Cadmium adsorption in soil influenced by dissolved organic matter derived from rice straw and sediment

CHEN Tongbin¹, CHEN Zhijun²

1. Department of Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101;
2. Institute of Information, Guangxi Academy of Sciences, Nanning 530022

Received:2001-07-19 Revised:2001-08-09 Online:2002-02-15

摘要/Abstract

摘要： 水溶性有机质(DOM)是陆地生态系统和水生生态系统中的一种很活跃的组分.本文以赤红壤、水稻土和褐土作为供试土壤,研究了来源于稻秆和底泥的DOM对土壤中Cd吸附行为的影响.DOM对土壤中Cd的吸附行为具有明显的抑制作用.这种抑制作用与土壤类型和DOM种类有关.在3种供试土壤中,无论添加稻秆DOM还是底泥DOM,都会使Cd的最大吸附容量和吸附率明显降低,其下降幅度为17.3%～93.9%.在添加同一种DOM的前提下,DOM对Cd吸附的抑制作用均为:赤红壤>水稻土>褐土.如果不添加DOM,则土壤对Cd的最大吸附容量主要取决于土壤固相的吸附特性,添加DOM后土壤对Cd的最大吸附容量则主要取决于液相中的DOM.由此推断,传统的看法,通过施用有机肥来固定土壤中的Cd并达到治理重金属污染土壤的观点值得商榷.

关键词: 土壤, Cd, 吸附, 水溶性有机质(DOM)

Abstract: Dissolved organic matter (DOM) is an active component in territorial ecosystems.Effects of two types of DOMs extracted from sediment(DOM_sed) and rice straw(DOM_rs) on isotherm adsorption of Cd in latosol red soil (acidic soil),paddy soil and drab soil(alkaline soil)were studied using batch equilibrium studies.The maximum adsorption of Cd in all the 3 soils used was reduced by the additions of both of DOM_sed and DOM_rs.The range of the maximum adsorption of Cd decreased from 17.3% to 93.9% from all the 3 soils when DOMs were added.It was found that the decreaseds in the maximum adsorption of Cd was in order of latosol red soil>paddy soil>drab soil when the same DOM(DOM_sed or DOM_rs) was added.Effects of DOM_sed or DOM_rs on Cd adsorption were positively related with the soil pH.The maximum adsorption of Cd in the soils was dependent on the characteristics of soil solid when no DOMwas added,and decided by the DOMs in soil solutiom when DOM was added.The results imply that the proposed technology using organic manure to stablize Cd in soils is not suitable for remediation of contaminated soil.

Key words: Soil, Cd, Adsorption, Dissolved organic matter(DOM)

中图分类号:

X171.5

陈同斌, 陈志军. 水溶性有机质对土壤中镉吸附行为的影响[J]. 应用生态学报, 2002, (2): 183-186.

CHEN Tongbin, CHEN Zhijun. Cadmium adsorption in soil influenced by dissolved organic matter derived from rice straw and sediment[J]. Chinese Journal of Applied Ecology, 2002, (2): 183-186.

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