Pedosphere 15(4): 432--439, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of dissolved organic matter on chlorotoluron sorption and desorption in soils |
YANG Hong1 , WU Xin1, ZHOU Li-Xiang2 and YANG Zhi-Min3 |
1 Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095 (China). E-mail: zydua@issas.ac.cn;
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)-1, 1-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. |
| Key Words: chlorotoluron, desorption, dissolved organic matter, sludge, sorption |
| Citation: Yang, H., Wu, X., Zhou, L. X. and Yang, Z. M. 2005. Effect of dissolved organic matter on chlorotoluron sorption and desorption in soils. Pedosphere. 15(4): 432-439. |
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