利谷隆在土壤中的吸附过程与机理

Adsorption Behaviour of Herbicide Linuron in Soils.

利谷隆是一种广泛应用的除草剂。本文研究了它在４种不同理化特性土壤中的吸附过程（平衡吸附所需的时间，土壤ｐＨ的影响及吸附等温线）和在单离子饱和的粘土矿物上的吸附机理。结果表明：利谷隆在土壤上的吸附强度大（Ｋｆ值在３．８８—９３．８４）；达到吸附平衡的时间短（５ｈ）；ｐＨ值降低，有利于吸附，ｐＨ在４—６范围内变化较明显．另外，利谷隆在土壤中形成氢键、配位键及离子键是可能的。

The adsorption behaviour of herbicide linuron in four soils differing in their physico-chemical properties,has been studied using a batch technique.Adsorption data could be fitted to a Freundlich--type equation. The value of the exponent in the fitted Freundlich isotherms varied from 1.11 to 1. 28,and Kf varied widely for four soils (from 3. 88 to 93. 84 ). Adsorption was found to be better correlated with five times OM% plus Clays% after dividing soil pH value (r = 0.996).The adsorption from chloroform solution of linuron on Pe3+,AI3+,Ca2+ and K+ exchanged bentonite sample was also investigated. The some bonding mechanisms,hydrogen--bond, coordination bond and ionic bond,between herbicide to soil components were supposed.