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土壤圈(英文版). 2005, (04)

Effect of Dissolved Organic Matter on Chlorotoluron Sorption and Desorption in SoilsEnglish Full Text

YANG Hong1, WU Xin1, ZHOU Li-Xiang2 and YANG Zhi-Min3 1 Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095 (China). 2 College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China) 3 College of Life Science, Nanjing Agricultural University, Nanjing 210095 (China)

Abstract: A batch equilibrium techniques was used to examine the effect of dissolved organic matter （DOM） extracted from both non-treated sludge （NTS） and heat-expanded sludge （HES） on the sorption and desorption of chlorotoluron （3-（3- chloro-p-tolyl）-l,l-dimethylurea） in two types of soils, a yellow fluvo-aquic and a red soil from China. Without DOM, sorption of chlorotoluron was significantly greater （P ＜ 0.05） in the red soil than in the yellow fluvo-aquic soil. However, with DOM the effect was dependent on the soil type and nature of DOM. Chlorotoluron sorption was lower in the yellow fluvo-aquic soil than in the red soil, suggesting that with the same DOM levels the yellow fluvo-aquic soil had a lower sorption capacity for this herbicide. Application of DOM from both NTS and HES led to a general decrease in sorption to the soils and an increase in desorption from the soils. Desorption of chlorotoluron also significantly increased （P ＜ 0.05） with an increase in the DOM concentration. Additionally, for sorption and desorption, at each DOM treatment level the NTS treatments were significantly lower （P ＜ 0.05） than the HES treatments. This implied that non-treated sludge had a greater effect on the sorption and desorption of chlorotoluron than heat-expanded sludge.
Keywords：

chlorotoluron; desorption; dissolved organic matter; sludge; sorption;

  • Series：

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (D) Agriculture

  • Subject：

    Environment Science and Resources Utilization

  • Classification Code：

    X53

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