Influence of molecular structure on sorption of phenoxyalkanoic herbicides on soil and its particle size fractions
Influence of molecular structure on sorption of phenoxyalkanoic herbicides on soil and its particle size fractions
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DOI：
10.1021/jf9912856
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发表时间：
2000-08-01
影响因子：
6.1
通讯作者：
Gerzabek, MH
中科院分区：
文献类型：
--
作者：
Haberhauer, G;Pfeiffer, L;Gerzabek, MH
研究了4种苯氧基烷酸类除草剂及其代谢物在4种农田土壤和不同土壤粒级上的吸附和解吸行为。总体上表现为吸附增加、解吸减少的趋势，顺序为mecoprop<；MCPA<；敌敌畏<；2，4-D。酚类代谢物在有机土壤基质中的吸附显著增加，其原因是它们的极性较低，在有机土壤基质中的分配增强。只有沙质土壤和粉质棕壤才能从颗粒级配吸附数据估算吸附分配系数。空间需求的增加，例如分子体积的增加，以及化合物的极性的微小变化，都会影响它们的吸附性能。通过比较从不同土壤中获得的结构相似的化合物的吸附和解吸数据，可以研究结构引起的吸附强度差异。
The sorption and desorption behaviors of four phenoxyalkanoic acid herbicides and their metabolites on four agricultural soils and soil particle size fractions were examined. Generally, there was a trend of increasing adsorption and decreasing desorption in the order mecoprop < MCPA < dichlorprop < 2,4-D. The significant increase in adsorption of the phenolic metabolites can be explained by their lower polarity and enhanced partition in the organic soil matrix. Estimation of sorption distribution coefficients from particle size fraction adsorption data was possible for a sandy soil and a silty Cambisol soil only. It is suggested that increasing steric demand, for example, molecular volume, and slight changes in the polarity of the compounds affect their adsorption properties. Comparison of adsorption and desorption data of structurally similar compounds obtained from a variety of soils allows investigation of structure-induced differences in sorption strength.