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This article in SSSAJ

  1. Vol. 76 No. 5, p. 1579-1591
     
    Received: June 15, 2011
    Published: September 12, 2012


    * Corresponding author(s): cefbli@soil.gd.cn
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doi:10.2136/sssaj2011.0225

Effect of pH and Weathering Indices on the Reductive Transformation of 2-Nitrophenol in South China

  1. Liang Taoa,
  2. Wei Zhangb,
  3. Hui Lic,
  4. FangBai Li *d,
  5. WeiMin Yud and
  6. ManJia Chene
  1. a Guangdong Key Lab. of Agricultural Environment Pollution Integrated Control Guangdong Institute of Eco- Environmental and Soil Sciences Guangzhou, 510650, PR China
    b Guangdong Key Lab. of Agricultural Environment Pollution Integrated Control Guangdong Institute of Eco- Environmental and Soil Sciences Guangzhou, 510650, PR China and Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640, PR China and Graduate School of The Chinese Academy of Sciences Beijing 100039, PR China
    c School of Computer Science South China Normal Univ.Guangzhou 510631, PR China
    d Guangdong Key Lab. of Agricultural Environment Pollution Integrated Control Guangdong Institute of Eco- Environmental and Soil Sciences Guangzhou, 510650, PR China
    e Guangdong Key Lab. of Agricultural Environment Pollution Integrated Control Guangdong Institute of Eco- Environmental and Soil Sciences Guangzhou, 510650, PR China and Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640, PR China and Graduate School of The Chinese Academy of Sciences Beijing 100039, PR China

Abstract

Iron is the first abundant transition metal in the Earth’s crust; soils in subtropical and tropical zones contain a large amount of free Fe oxide and have thus been paid increasing attention. In this study, 22 soil samples were collected from the A (0–20-cm) horizon in South China and divided into three groups (i.e., vegetable soils in Pearl River Delta, orchard soils in Pearl River Delta, and forest soils in tropical zone). Two types of experiments, one without buffer 2-(N-morpholino)ethanesulfonic acid (MES) and another with MES, were conducted to investigate the effect of pH and weathering indices on the reductive transformation of 2-nitrophenol (2-NP) on soils. Kinetic measurements showed an increase in pH resulted in an enhanced reaction rate (k) of 2-NP reduction. From cyclic voltammogram tests, the enhanced activity of Fe(II) species was attributed to the negative shift of peak oxidation potential of the Fe(III)–Fe(II) couple. The results were subjected to statistical analysis, including the evaluation of variance and correlation, and the application of stepwise regression. Significant differences in k values were obtained in the different soil types and parent materials. The reaction pH proved to be an essential factor in 2-NP reductive transformation, and the weathering indices of soils had a critical effect on the 2-NP reductive transformation processes in soils. With an increase in the level of soil desilicification and allitization from Groups I to III, the k value increased consistently in the order of the decrease in the weathering indices. These findings improve our general understanding of the effect of pH and weathering indices on soil Fe redox chemistry and provide valuable information on the implications for research on soil pollution control.

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Copyright © 2012. Copyright © by the Soil Science Society of America, Inc.

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