Pedosphere 11(3): 217--226, 2001
ISSN 1002-0160/CN 32-1315/P
©2001 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Adsorption of acetanilide herbicides on soil and its components: Ⅳ. Sorption of acetanilide herbicides on soils and its correlation with soil properties
LIU Wei-Pin1,2, WANG Qi-Quan2, YANG Wei-Chun2 and WANG Xiao-Rong1
1 State Key Laboratory of Pollution Control and Resource Reuse Research, Nanjing University, Nanjing 210093 (China)
2 Institute of Environmental Science, Zhejiang University at Yuquan, Hangzhou 310027
ABSTRACT
      Sorption of acetanilide herbicides, metolachlor, acetochlor, pretilachlor and butachlor on eight soils with various physical and chemical properties was studied. The adsorption isotherms could fit Freundlich equation well (r2 ≥ 0.91) and the adsorption extents increased in the order: metolachlor < acetochlor < pretilachlor < butachlor. The product of Freundlich adsorption constants, Kf (1/n), showed to have a good correlation with organic matter content (OM) of soils for each of these herbicides, suggesting that OM is the primary factor dominating in the adsorption process of these acetanilide herbicides. Multivariant correlation regression between Kf (1/n) and two factors, water solubility (Sw) of herbicides and OM, was also performed. Kf (1/n) correlated with 1/Sw and OM/Sw well, showing that high Sw corresponds to a weak tendency to adsorb on soils. Infrared (IR) spectra and electron spin resonance (ESR) parameters confirmed that multifunctional H-bonds and charge-transfer bonds were the main adsorption mechanisms of these acetanilide herbicides. The abilities of herbicides to form these adsorption bonds with HA increased in the same order as the extent of adsorption.
Key Words:  acetanilide herbicide, adsorption mechanism, correlation, soil
Citation: Liu, W. P., Wang, Q. Q., Yang, W. C. and Wang, X. R. 2001. Adsorption of acetanilide herbicides on soil and its components: Ⅳ. Sorption of acetanilide herbicides on soils and its correlation with soil properties. Pedosphere. 11(3): 217-226.
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