Relative influence of the dissolved humic material on the solid-phase extraction efficiency of pesticides from environmental water

The effect of organic matter on the solid-phase extraction (SPE) efficiency for pesticides belonging to different chemical groups (urea-derivatives, carbamates and triazines) and having different polarities, was simultaneously studied for the first time in pure and simulated water samples. SPE was c...

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Bibliographic Details
Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2007-08, Vol.42 (6), p.615-627
Main Authors: Garcia de Llasera, M.P, Rodriguez-Castillo, A, Vera-Avila, L.E
Format: Article
Language:English
Subjects:
Adsorption
Agronomy. Soil science and plant productions
Biological and medical sciences
breakthrough volume
carbamates
Carbon - chemistry
Chromatography, High Pressure Liquid - methods
Chromatography, High Pressure Liquid - standards
composite polymers
dissolved organic carbon
divinylbenzene
Environmental Monitoring - methods
environmental water
Fundamental and applied biological sciences. Psychology
high performance liquid chromatography
humic acids
Humic Substances - analysis
Kinetics
linear models
mathematical models
Online Systems
pesticides
Pesticides - chemistry
Reproducibility of Results
Sensitivity and Specificity
silica
simulation models
Soil and water pollution
Soil science
Solid Phase Extraction - methods
Solid Phase Extraction - standards
Solid-phase extraction
styrene
triazine herbicides
triazines
urea derivatives
urea herbicides
Water Pollutants, Chemical - analysis
water pollution
water treatment
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Summary:The effect of organic matter on the solid-phase extraction (SPE) efficiency for pesticides belonging to different chemical groups (urea-derivatives, carbamates and triazines) and having different polarities, was simultaneously studied for the first time in pure and simulated water samples. SPE was carried out in precolumns packed with C18 silica or styrene-divinylbenzene copolymer PLRP-S phases on-line coupled to high performance liquid chromatography (HPLC) analysis. Retention factors in water (k' W ) were estimated for 25 compounds and used for the calculation of the theoretical breakthrough volume (Vb T ) in pure water. Experimental breakthrough volumes (Vb E ) were first determined using purified and deionized water as the matrix for selected compounds having Vb T < 500 mL; then, the same water with an added humic acid sodium salt (HA) at 0.4-5.6 mg/L of dissolved organic carbon (DOC) content, was used as the matrix for compounds having VbE < 500 mL in pure water. Several polar pesticides showed negative linear or logarithmic Vb E curves depending on HA content; their recoveries were also determined in environmental samples having low dissolved organic carbon values, between 0.5-6.4 mg/L. A similar behavior was observed for these compounds in simulated and natural water samples, where DOC concentration and the percolated volume (Vp) mainly determine the solute recoveries values. However, the variation of recoveries as a function of DOC content could be negative or null depending on the two examined conditions (Vp lower or larger than Vb E in pure water). Results demonstrated that breakthrough volume must always be considered to correctly interpret the participation of dissolved humic material on the SPE efficiency of organic micropollutants in water.
ISSN:0360-1234
1532-4109
DOI:10.1080/03601230701465486