Using humic acid for remediation of sandy soils contaminated by heavy metal

YaJun Wang; HongLang Xiao; JinXi Wang; Yong Wang

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Using humic acid for remediation of sandy soils contaminated by heavy metal

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This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). Distribution of amount of Cr (VI) in the aqueous or solid system containing humic acid and sandy soil, was studied using batch experiments, es-pecially for effects of reaction time, pH, concentrations, temperature and irradiation on the reduction of Cr (VI), and the optimum reaction conditions. The results indicated a significant increase of the adsorption of Cr (VI) because of the complexion reaction between HA and Cr (VI) that occurred under acidic condition. The reaction mechanisms of HA with chromium on sand surfaces were certified. Thus it came to a conclusion that HA could be used effectively on remediation of Cr (VI)-contaminated soil and groundwater in a wide range of pH, with or without sunlight. These results suggest that the organic-inorganic complex-such as sandy soils coated with humic substances-is important as a metal reservoir in the environment.

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《寒旱区科学（英文版）》 |2009年第3期|267-276|共10页
作者
YaJun Wang; HongLang Xiao; JinXi Wang; Yong Wang;
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作者单位

Heihe Key Laboratory of Ecohydrology and River Basin Science,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China.;

Heihe Key Laboratory of Ecohydrology and River Basin Science,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China.;

School of Chemical Engineering,Gansu Lian He University,Lanzhou,Gansu 730000,China.;

Yantai Institute of Coastal Zone Research for Sustainable Development,Chinese Academy of Sciences,Yantai,Shandong 264003,China.;

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Using humic acid for remediation of sandy soils contaminated by heavy metal

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