Partitioning of the pesticide trifluralin between dissolved organic matter and water using automated SPME-GC/MS

Solid-phase microextraction (SPME) was used to determine the equilibrium association constant for a pesticide, trifluralin (TFR), with dissolved organic matter (DOM). After optimization of the SPME method for the analysis of TFR, partition coefficients (KDOM) with three different sources of DOM were...

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Bibliographic Details
Published in:Environmental science and pollution research international 2015-03, Vol.22 (6), p.4201-4212
Main Authors: Caupos, Emilie, Touffet, Arnaud, Mazellier, Patrick, Croue, Jean-Philippe
Format: Article
Language:English
Subjects:
absorbance
Acids
Analytical chemistry
Aquatic environment
Aquatic Pollution
Aqueous solutions
Atmospheric Protection/Air Quality Control/Air Pollution
Automation
Biofilms
Chemical Sciences
Dissolved organic matter
Earth and Environmental Science
Ecotoxicology
Environment
Environment and Society
Environmental Chemistry
Environmental Health
Environmental Sciences
Equilibrium
Freshwater environments
Gas Chromatography-Mass Spectrometry
Humic acids
Humic Substances - analysis
Leaching
partition coefficients
PCB
Pesticide toxicity
Pesticides
Pesticides - analysis
Pollutants
Polychlorinated biphenyls
Research Article
Solid phase methods
Solid Phase Microextraction
Surface water
Toxicity
Trifluralin
Trifluralin - chemistry
Waste Water Technology
Water - chemistry
Water Management
Water Pollutants, Chemical - analysis
Water Pollution Control
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Summary:Solid-phase microextraction (SPME) was used to determine the equilibrium association constant for a pesticide, trifluralin (TFR), with dissolved organic matter (DOM). After optimization of the SPME method for the analysis of TFR, partition coefficients (KDOM) with three different sources of DOM were determined in buffered solutions at pH 7. Commercial humic acids and DOM fractions isolated from two surface waters were used. The values of log KDOMvaried from 4.3 to 5.8, depending on the nature of the organic material. A good correlation was established between log KDOMand DOM properties (as measured with the H/O atomic ratio and UV absorbance), in agreement with literature data. This is consistent with the effect of polarity and aromaticity for governing DOM-pollutant associations, regardless of the origin of DOM. This association phenomenon is relevant to better understand the behavior of pesticides in the environment since it controls part of pesticide leaching and fate in aquatic systems.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-014-3614-0