Relation between the molecular structure and the adsorption of arylcarbamate, phenylurea and anilide pesticides in soil and model organic adsorbents

Adsorption of Pesticides and Their Biodegraded Products on Clay Minerals and Soils.

“…[4][5][6] In this study, we attempted to compare the difference in adsorption on a variety of soils and clay minerals as elements of soil with adsorption isotherms.…”

Influence of the molecular structure of 12 N-methyl-arylcarbrmate insecticides on their degradation in soil

“…The procedure used for synthesizing 14 C-labelled carbamates and for determining the molecular parameters considered (Table 1), as well as the properties of the 4 soils under investigation (silt : pH 7.85; silt loam: pH 6.85; sand : pH 5.20 and peat: pH 5.90) have been described previously (Pussemier et al, 1989). Two more silt loam samples originating from the same location as the first one, but differing by the nature of their vegetal cover, were added for the degradation studies.…”

“…Therefore, the mean relative half life value, (T°o.5) m f was determined for each compound in a similar way as previously for the adsorption constants (Pussemier et al, 1989). This seems to be justified, since the correlation coefficient matrix (Table 3) established on the basis of the individual T°0.5 values indicates that the investigated soils behave similarly : the correlation coefficient is always equal to or higher than 0.89 except for the silt.…”

A quantitative structure–activity relationships (QSAR) analysis of triarylmethane dye tracers

“…QSAR have been successfully applied to predict soil sorption coefficients of non-polar and nonionizable organic compounds including many pesticides (Gerstl and Helling, 1987;Pussemier et al, 1989). Sorption of organic chemicals in soils or sediments is usually described by sorption coefficients.…”

“…Sorption coefficients normalized by organic carbon content (log K oc or log K om ) have been used in several QSAR models (Pussemier et al, 1989;Sabljić, 1987Sabljić, , 1989Sabljić, , 2001Meylan et al, 1992). Soil sorption of ionizable, hydrophobic organic chemicals could be estimated using a QSAR model which included the octanol/water partition coefficient, organic carbon content, and correction factors for acids and bases (Bintein and Devillers, 1994).…”