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研究了除草剂哌草丹在土壤、水环境中的吸附、脱附、水解及光解过程．结果指出：哌草丹在土壤上的吸附主要受土壤有机质的影响，粘土矿也有一定作用．吸附和脱附均可用Ｆｒｅｕｎｄｌｉｃｈ方程描述；根据降解产物推测了哌草丹的水解和光降解的机理，哌草丹的水解产物为２苯基丙烯和六氢吡啶等，六氢吡啶可与土壤粘土矿（蒙脱石）作用，并与蒙脱石层间阳离子形成配合物；哌草丹光降解的产物为六氢吡啶、苯乙酮和甲醛
Adsorption, desorption, hydrolysis and photolysis processes of the herbicide Pendimethalin in soil and water environment were studied. The results indicated that the adsorption of Pipaloxine on the soil was mainly affected by soil organic matter, and clay mineral also had a certain effect. Adsorption and desorption can be described by the Freundlich equation. According to the degradation products, the mechanism of photodegradation and photodegradation of Pichia pastoris is inferred. The hydrolyzate of Pisacetam is 2-phenylpropene and piperidine, (Montmorillonite), and formed a complex with the interlayer of the montmorillonite. The photodegradation products of piperadine were hexahydropyridine, acetophenone and formaldehyde