Sorption characterization of pesticides onto particulate organic matter from soils
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Abstract
Two herbicides with very different physico-chemical properties were used: isoproturon, moderately hydrophobe; diflufenican, strongly hydrophobe, and isopropylaniline, a metabolite of isoproturon to characterize properties of sorption and desorption of organic matter particulate (MOP) from soils with three different types of occupation: a cropped plot, a grasses strip and a forested area. The results show the different capabilities of sorption of the MOP are related to their origin, size, chemical composition and its degree of hydrophobicity. Diflufenican (Kd between 123 and 483 l kg-1) and isopropylaniline (Kd between 207 and 1275 l kg-1) were largely retained by the MOP. The sorption capacities of MOP increase when their sizes particulates decrease. That was related to increase of its exchange surface and of the number of sorption sites. The isoproturon sorption and the diflufenican increases with the degree of hydrophobicity of the MOP. Aromaticity of the MOP was positively correlated with the sorption coefficient (Koc). Desorption of a more hydrophobic compounds was weak for all fractions of MOP regardless of their origin and size: diflufenican (5%) and isopropylaniline (4%). The isoproturon desorption was higher (> 90%) depending of type of occupation of the soil and MOP characteristics. These results show that the grasses strip and a forested area MOP has an important role in the interception of the pesticides present in the runoff. Depending on the type of pesticides, it is foreseeable that less hydrophobic compounds shall be readily desorbed and transported more easily in the runoff and infiltration events while more hydrophobic compounds will be more irreversibly adsorbed by the superficial layers of soil.
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