title: Molecular properties affecting the adsorption coefficient of pesticides from various chemical families.
abstract: Forty pesticides were selected in function of their chemical families and their physico-chemical properties to represent a wide range of pesticide properties. Adsorption of these pesticides was studied on two soils by batch experiments. The two soils differed largely in organic matter and calcite contents. Distribution coefficient Kd was determined for each pesticide on the two soils. Adsorption was higher for the soil having the highest organic matter content and the lowest calcite content. In order to identify pesticide properties governing retention, eight molecular descriptors were determined from three-dimensional (3D) structure of molecules. Class-specific quantitative structure properties relationship (QSPR) soil adsorption models using one and two parameters were developed from experimental Kd. Three properties seemed to influence most retention of pesticides: hydrophobicity, solubility, and polarisability. Models combining these properties were suggested and discussed.
authors.affiliation: Institut de Chimie Moléculaire de Reims (ICMR, UMR CNRS 7312), Groupe Chimie de Coordination, Université de Reims Champagne-Ardenne, BP 1039, 51687, Reims Cedex 2, France.
authors.forename: Julie
authors.initials: J
authors.lastname: Langeron
authors.forename: Alodie
authors.initials: A
authors.lastname: Blondel
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Sayen
authors.forename: Eric
authors.initials: E
authors.lastname: Hénon
authors.forename: Michel
authors.initials: M
authors.lastname: Couderchet
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Guillon
mesh_terms: D000327:Adsorption; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D012995:Solubility
chemical_list: D010575:Pesticides; D012987:Soil; D012989:Soil Pollutants