几种有机物对紫色土镉的溶出效应与吸附-解吸行为影响的研究
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* 国家自然科学基金项目(40071049);国家博士后基金(批准号:10129);西南农业大学博士后基金资助


EFFECTS OF SEVERAL ORGANIC SUBSTANCES ON THE SOLUBILITY AND ADSORPTION-DESORPTION BEHAVIORS OF CADMIUM IN PURPLISH SOIL
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    摘要:

    研究了天然有机物胡敏酸和富里酸,螯合剂EDTA和DTPA和四种简单有机酸对紫色土镉的溶出效应和吸附解吸行为的影响。结果表明,供试八种有机物均能显着促进镉从紫色土中的溶出。作用大小顺序为:EDTA≥DTPA>柠檬酸>胡敏酸>草酸>富里酸>酒石酸≥水杨酸。有机物对土壤镉溶出和迁移的影响是其对土壤镉吸附和解吸综合作用的结果。有机物显着降低了紫色土对镉的吸附,其作用大小顺序与其对镉的溶出能力的相对大小顺序一致,同时也改变了吸附镉的解吸特性。有机物影响下,紫色土镉的吸附动力学模型以双常数方程拟合最佳。而吸附等温曲线以Freundlich方程拟合最好,吸附常数n与有机物对土壤镉的溶出率之间存在良好的相关性。

    Abstract:

    The effects of several organic substances,including natural humic acid and fulvic acid,artificial chelating agents EDTA and DTPA,and four simple organic acids on the solubility and adsorption-desorption behaviors of purplish soil for cadmium were studied.Results showed that all the organic substances tested significantly promoted the solubility of cadmium from the purplish soil,with a magnitude sequence of EDTA≥DTPA>citric acid>humic acid>oxalic acid>fulvic acid>tartaric acid≥salicylic acid. These effects were attributed to their comprehensive influences on the adsorption and desorption of the soil for cadmium.Organic substances remarkably inhibited the adsorption of purplish soil for cadmium.The sequence of the inhibiting effects was as same as their influences on cadmium dissolubility.Desorption characteristics of absorbed cadmium were also altered by these organic substances.At the presence of organic substances the adsorption kinetics of purplish soil for cadmium was best fitted by the double-constant equation,and the curves of isothermal adsorption was best described by Freundlich equation.The adsorption constant n in Freundlich equation was well correlated with the dissolving rate of cadmium.

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魏世强,木志坚,青长乐.几种有机物对紫色土镉的溶出效应与吸附-解吸行为影响的研究[J].土壤学报,2003,40(1):110-117. DOI:10.11766/trxb200102200115 Wei Shi-qiang, Mu Zhi-jian, Qing Chang-le. EFFECTS OF SEVERAL ORGANIC SUBSTANCES ON THE SOLUBILITY AND ADSORPTION-DESORPTION BEHAVIORS OF CADMIUM IN PURPLISH SOIL[J]. Acta Pedologica Sinica,2003,40(1):110-117.

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  • 收稿日期:2001-02-20
  • 最后修改日期:2001-12-29
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  • 在线发布日期: 2013-02-25
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