Binding of Atrazine to Humic Substances from Soil, Peat, and Coal Related to Their Structure

Partition coefficients for the binding affinities of atrazine to 16 different humic materials were determined by the ultrafiltration HPLC technique. Sources included humic acids (HA), fulvic acids (FA), and combined humic and fulvic fractions (HF) from soil, peat, and coal humic acid. Each of the hu...

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Bibliographic Details
Published in:Environmental science & technology 2002-09, Vol.36 (17), p.3720-3724
Main Authors: Kulikova, Natalia A, Perminova, Irina V
Format: Article
Language:English
Subjects:
Atrazine - chemistry
Benzopyrans - chemistry
Chromatography, High Pressure Liquid
Coal - analysis
Herbicides
Herbicides - chemistry
Humic Substances - chemistry
Magnetic Resonance Spectroscopy
Soil - analysis
Soil Pollutants
Soils
Structure-Activity Relationship
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Summary:Partition coefficients for the binding affinities of atrazine to 16 different humic materials were determined by the ultrafiltration HPLC technique. Sources included humic acids (HA), fulvic acids (FA), and combined humic and fulvic fractions (HF) from soil, peat, and coal humic acid. Each of the humic materials was characterized by elemental composition, molecular weight, and composition of main structural fragments determined by 13C solution-state NMR. The magnitude of K OC values varied from 87 to 575 L/kg of C, demonstrating relatively low binding affinity of humic substances (HS) for atrazine. On the basis of the measured K OC values, the humic materials can be arranged in the following order:  coal HA ≅ gray wooded soil HA > chernozemic soil HA and HF > sod-podzolic soil HA ≅ peat HF > sod-podzolic soil FA ≫ peat dissolved organic matter. The magnitude of the K OC values correlated strongly with the percentage of aromatic carbon in HS samples (r = 0.91). The hydrophobic binding was hypothesized as the key interaction underlying the binding of atrazine to HS.
ISSN:0013-936X
1520-5851
DOI:10.1021/es015778e