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土壤有机质对镉在土壤中吸附-解吸行为的影响

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焦文涛, 蒋新, 余贵芬, 王代长, 卞永荣, 邓建才. 土壤有机质对镉在土壤中吸附-解吸行为的影响[J]. 环境化学, 2005, 24(5): 545-549.
引用本文: 焦文涛, 蒋新, 余贵芬, 王代长, 卞永荣, 邓建才. 土壤有机质对镉在土壤中吸附-解吸行为的影响[J]. 环境化学, 2005, 24(5): 545-549.
shu
JIAO Wen-tao, JIANG Xin, YU Gui-fen, WANG Dai-zhang, BIAN Yong-rong, DENG Jian-cai. EFFECTS OF ORGANIC MATTER ON CADMIUM ADSORPTION-DESORPTION IN THREE SOILS[J]. Environmental Chemistry, 2005, 24(5): 545-549.
Citation: JIAO Wen-tao, JIANG Xin, YU Gui-fen, WANG Dai-zhang, BIAN Yong-rong, DENG Jian-cai. EFFECTS OF ORGANIC MATTER ON CADMIUM ADSORPTION-DESORPTION IN THREE SOILS[J]. Environmental Chemistry, 2005, 24(5): 545-549.
shu

土壤有机质对镉在土壤中吸附-解吸行为的影响

  • 1.

    中国科学院南京土壤研究所, 南京, 210008

  • 基金项目:

    国家自然科学基金(40201025,40325001)

    江苏省自然科学基金重点项目(BK2005220)

    中国科学院知识创新前沿项目(No.ISSASIP0202)

    国际科学基金项目(IFSC/3403-1)资助

EFFECTS OF ORGANIC MATTER ON CADMIUM ADSORPTION-DESORPTION IN THREE SOILS

  • 1.

    Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008

  • Fund Project:

  • 摘要: 研究了Cd2+在红壤、黄泥土、乌栅土及去除有机质后的三种土壤中的吸附-解吸行为.结果表明,有机质的去除显著降低了三种土壤体系Cd2+吸附-解吸平衡液的pH值,ΔpH范围为0.51到3.05.三种土壤中Cd2+的吸附量大小为:乌栅土黄泥土红壤,与土壤有机质含量的顺序一致;去除有机质后土壤对Cd2+的吸附量均明显下降,尤其是有机质含量高的黄泥土和乌栅土;三种土壤有机质对Cd2+吸附的贡献率平均值分别为红壤43.75%、黄泥土544.77%、乌栅土993.76%.Cd2+在所有土壤中的吸附均可用Freun-dlich方程来描述,相关系数均大于0.991,吸附亲和力的变化与吸附量大小的变化一致,n值在0.350到0.975之间变化.三种土壤中Cd2+解吸量依次减少,红壤中Cd2+解吸率均在50%以上,而黄泥土和乌栅土中解吸率最高为42%和19%;去除有机质后解吸率均在50%以上,且解吸量相差不大.
    Abstract: The adsorption-desorption behaviors of Cd2+ in red soil, Huangni soil and Wushan soil were studied in present study. The results showed that the pHva lues of adsorption-desorption equilibrium system in three soils decreased signi ficantly as soil organic matter(SOM) was removed. The decrease of pH values rang ed from 0.5 to 3.05. With the content of SOM increasing, amount of Cd2+ a dsorbed increased. The amount of Cd2+ adsorbed reduced drastically afte r SOMwas removed, especially for Huangni soil and Wushan soils with high conten ts of SOM. The contribution rate of SOM to the adsorption of Cd2+ were 43 .75%, 544.77%, 993.76%in Red soil, Huangni soil and Wushan soil, respectively . All processes of Cd2+ adsorption in soils could be described by Freun dlich isotherms with the correlation coefficient higher than 0.991.The variati on of Cd affinity for three soils explained well the variationof amount of Cd2+ adsorbed and n values ranged from 0.350 to 0.975.The desorption amoun t of Cd2+ in red soil, Huangni soil and Wushan soil decreased in turn. The desorption rate of Cd2+ in Red soil was 50%, whereas the maximum desorpti on rate of Cd2+ were 42% and 19% in Huangni soil and Wushan soil, respectiv ely.The desorption rate was 50% after SOM was removed and the desorption amoun t of Cd2+ didn't vary significantly.
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  • [1] 陈怀满著,土壤-植物系统中的重金属污染[M] .北京:科学出版社, 1996
    [2] 宗良纲,徐晓炎,土壤中镉的吸附解吸研究进展[J] .生态环境, 2003,12(3): 331-335
    [3] 徐明岗,李菊梅,张青,pH对黄棕壤重金属解吸特征的影响[J] .生态环境, 2004,13(3): 312-315
    [4] 费宇红,曹树堂,张光辉等,镉在土壤中吸附与沉淀的特征与界限[J] .地球学报, 1998,19(4): 409-414
    [5] 倪吾钟,龙新宪,杨肖娥,菜园土壤镉吸附-解吸特性的研究[J] .广东微量元素科学, 2000,7(10): 11-14


    [6] Gray C W, Mclaren R G,Roberts A H C et al., Solubility, Sorption and Desorption of Native and Added Cadmium in Relation to Properties of Soils in New Zealand [J] .European Journal of Soil Science, 1999,50:127-137
    [7] Naidu R, Kookana R S, Sumner M E et al.,Cadmium Sorption and Transport in Variable Charge Soil: A Review [J] .J. Environ.Qual., 1997,26: 602-617

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  • 收稿日期:  2004-12-22
焦文涛, 蒋新, 余贵芬, 王代长, 卞永荣, 邓建才. 土壤有机质对镉在土壤中吸附-解吸行为的影响[J]. 环境化学, 2005, 24(5): 545-549.
引用本文: 焦文涛, 蒋新, 余贵芬, 王代长, 卞永荣, 邓建才. 土壤有机质对镉在土壤中吸附-解吸行为的影响[J]. 环境化学, 2005, 24(5): 545-549.
shu
JIAO Wen-tao, JIANG Xin, YU Gui-fen, WANG Dai-zhang, BIAN Yong-rong, DENG Jian-cai. EFFECTS OF ORGANIC MATTER ON CADMIUM ADSORPTION-DESORPTION IN THREE SOILS[J]. Environmental Chemistry, 2005, 24(5): 545-549.
Citation: JIAO Wen-tao, JIANG Xin, YU Gui-fen, WANG Dai-zhang, BIAN Yong-rong, DENG Jian-cai. EFFECTS OF ORGANIC MATTER ON CADMIUM ADSORPTION-DESORPTION IN THREE SOILS[J]. Environmental Chemistry, 2005, 24(5): 545-549.
shu

土壤有机质对镉在土壤中吸附-解吸行为的影响

  • 1. 中国科学院南京土壤研究所, 南京, 210008
  • 收稿日期:  2004-12-22
基金项目:

国家自然科学基金(40201025,40325001)

江苏省自然科学基金重点项目(BK2005220)

中国科学院知识创新前沿项目(No.ISSASIP0202)

国际科学基金项目(IFSC/3403-1)资助

摘要: 研究了Cd2+在红壤、黄泥土、乌栅土及去除有机质后的三种土壤中的吸附-解吸行为.结果表明,有机质的去除显著降低了三种土壤体系Cd2+吸附-解吸平衡液的pH值,ΔpH范围为0.51到3.05.三种土壤中Cd2+的吸附量大小为:乌栅土黄泥土红壤,与土壤有机质含量的顺序一致;去除有机质后土壤对Cd2+的吸附量均明显下降,尤其是有机质含量高的黄泥土和乌栅土;三种土壤有机质对Cd2+吸附的贡献率平均值分别为红壤43.75%、黄泥土544.77%、乌栅土993.76%.Cd2+在所有土壤中的吸附均可用Freun-dlich方程来描述,相关系数均大于0.991,吸附亲和力的变化与吸附量大小的变化一致,n值在0.350到0.975之间变化.三种土壤中Cd2+解吸量依次减少,红壤中Cd2+解吸率均在50%以上,而黄泥土和乌栅土中解吸率最高为42%和19%;去除有机质后解吸率均在50%以上,且解吸量相差不大.

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