Analysis and study of the distribution of polar and non-polar pesticides in wastewater effluents from modern and conventional treatments

The analysis of a wide range of pesticides in wastewaters (WWs) undergoing different treatments (both modern and conventional) has been studied. The need for optimizing specific extraction methods for each WW effluent based on their physico-chemical characteristics has been considered. A distributio...

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Bibliographic Details
Published in:Journal of Chromatography A 2010-12, Vol.1217 (50), p.7817-7825
Main Authors: Barco-Bonilla, Nieves, Romero-González, Roberto, Plaza-Bolaños, Patricia, Garrido Frenich, Antonia, Martínez Vidal, José Luis
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Aqueous phase
Chemistry
Chromatographic methods and physical methods associated with chromatography
Effluents
Exact sciences and technology
Extraction
Gas chromatographic methods
Hydrophobicity
Liquid chromatography
Other chromatographic methods
Other wastewaters
Pesticides
Pollution
Ponds
Standard deviation
Suspended particulate matter
Waste water
Wastewater effluents
Wastewaters
Water treatment and pollution
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Summary:The analysis of a wide range of pesticides in wastewaters (WWs) undergoing different treatments (both modern and conventional) has been studied. The need for optimizing specific extraction methods for each WW effluent based on their physico-chemical characteristics has been considered. A distribution study was performed to establish if the filtration step before extraction is a correct procedure since pesticides can be more prone to be in the aqueous or the solid phase, depending on their hydrophobicity. This evaluation demonstrated that pesticides are distributed between the aqueous phase and the suspended particulate matter (SPM; e.g. pyrethroids are only found in the SPM). The proposed methodologies involved the determination of 39 polar and 139 non-polar pesticides using solid-phase extraction (SPE) and pressurized-liquid extraction (PLE) for the extraction of the aqueous phase and the SPM, respectively. Ultra high pressure liquid chromatography and gas chromatography coupled to tandem mass spectrometry (UHPLC–MS/MS, GC–MS/MS) were used in the determination stage. WW samples from four different technologies were evaluated: membrane bioreactor, extended aeration, maturation pond and anaerobic pond. Validation data for the four effluents studied were generated, obtaining adequate precision values (estimated as % relative standard deviation, RSD) in almost all cases (
ISSN:0021-9673
DOI:10.1016/j.chroma.2010.10.011