Adsorption of Acetanilide Herbicides on Soil and Its Components: Ⅳ. Sorption of Acetanilide Herbicides on Soils and its Correlation with Soil PropertiesEnglish Full Text

LIU WEIPING; WANG QIQUAN; YANG WEICHUN; and WANG XIAORONG State Key Laboratory of Pollution Control and Resource Reuse Research, Nanjing University, Nanjing 210093 (China); Institute of Environmental Science, Zhejiang University at Yuquan, Hangzhou 510027

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 Freundich equation well （r 2 ≥0.91） and the adsorption extents increased in the order: metolachlor ＜ acetochlor ＜ pratilachlor ＜ 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 asetanilide herbicides. Multivariant correlation regression between Kf （1/n） and two factors, water solubility （S.） of herbicides and OM, was also performed. Kf（1/n） correlated with 1/S. and OM/S. well, showing that high S. 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.

Keywords：

acetanilide herbicide; adsorption mechanism; correlation; soil;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Adsorption of Acetanilide Herbicides on Soil and Its Components: Ⅳ. Sorption of Acetanilide Herbicides on Soils and its Correlation with Soil PropertiesEnglish Full Text

LIU WEIPING; WANG QIQUAN; YANG WEICHUN; and WANG XIAORONG State Key Laboratory of Pollution Control and Resource Reuse Research, Nanjing University, Nanjing 210093 (China); Institute of Environmental Science, Zhejiang University at Yuquan, Hangzhou 510027

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