Influence of the Polarity of Organic Matter on the Sorption of Acetamide Pesticides

Understanding and quantifying the sorption of agrochemicals onto soils is essential to predict their fate and transport in the environment. While many correlations exist between partition coefficients of organic pollutants onto soils and the quantity of soil organic matter, only recently studies hav...

Full description

Saved in:
Bibliographic Details
Published inJournal of agricultural and food chemistry Vol. 45; no. 8; pp. 3320 - 3325
Main Authors Torrents, Alba, Jayasundera, Shalini, Schmidt, Walter J
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.08.1997
Subjects
Agronomy. Soil science and plant productions
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
MATERIA ORGANICA
MATIERE ORGANIQUE
ORGANIC MATTER
PESTICIDE
PESTICIDES
PLAGUICIDAS
Soil and water pollution
Soil science
SORCION
SORPTION
Differential scanning calorimetry
Organic matter
Alachlor
Pollutant behavior
Pesticides
Adsorption isotherm
Partition coefficient
Polar compound
Soil pollution
Herbicide
Sorption
Polarity
Organic amide
Desorption isotherm
Acetamide(N-aryl-2-chloro)
Sorbent
Online AccessGet full text

Cover

More Information
Summary:Understanding and quantifying the sorption of agrochemicals onto soils is essential to predict their fate and transport in the environment. While many correlations exist between partition coefficients of organic pollutants onto soils and the quantity of soil organic matter, only recently studies have revealed the importance of the nature of soil organic matter. Here we report on the uptake of three acetamide pesticides onto four model organic sorbents. The organic carbon referenced sorption coefficient, K oc, decreased with the increasing polarity index (PI) (O + N/C) of the organic sorbent. A regression of K ow, solubility, and polarity index indicated that such correlations are very specific to the pollutant class. Apart from the quality of the organic sorbent properties, the hydrophobicity of the pesticide and the presence of functional groups also contribute to sorption. The more polar the solute and/or the organic sorbent the more likely it is that interactions other than hydrophobic will contribute to sorption, causing the currently used K oc − K ow correlations to fail. Keywords: Acetamide pesticides; alachlor; metolachlor; propachlor; organic sorbents; sorption; desorption
Bibliography:T01
P33
1997074094
ark:/67375/TPS-WMZW1G0V-Q
Abstract published in Advance ACS Abstracts, July 15, 1997.
istex:17538D8959BE844027E0B46EEDEEC9944C75E1E7
ISSN:0021-8561
1520-5118
DOI:10.1021/jf970112i