The degradation of 12 N-methyl arylcarbamates was studied in 6 different soils. The first metabolisation step, i.e. hydrolysis of the carbamate function was influenced by the nature of the soil as well as by the stucture of the aromatic moiety of the products. The half-lives of the carbamates determined in the different soils were used as degradation characteristics. They showed, in most cases, significant correlations when compared from soil to soil, but there was no correlation with the molecular parameters related either to their soil adsorption (Hansch's hydrophobicity parameter Π and Hildebrand's solubility parameter δ) or to their chemical hydrolysis (Hammet's electronic parameter σ). On the contrary, a very significant 117
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