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.
View Full Text



Copyright © 2019 Editorial Committee of PEDOSPHERE. All rights reserved.
Address: P. O. Box 821, 71 East Beijing Road, Nanjing 210008, China    E-mail: pedosphere@issas.ac.cn
Technical support: Beijing E-Tiller Co.,Ltd.