Photoinduced chemiluminescence determination of carbamate pesticides

A liquid chromatography method with post-column photoinduced chemiluminescence (PICL) detection is proposed for the simultaneous determination of eight carbamate pesticides, namely aldicarb, butocarboxim, ethiofencarb, methomyl, methiocarb, thiodicarb, thiofanox and thiophanate-methyl. After chromat...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2016-01, Vol.15 (5), p.626-634
Main Authors: Catalá-Icardo, M., Meseguer-Lloret, S., Torres-Cartas, S.
Format: Article
Language:English
Subjects:
Biochemistry
Biomaterials
Carbamates - analysis
Chemistry
Chromatography, High Pressure Liquid - instrumentation
Chromatography, High Pressure Liquid - methods
Equipment Design
Groundwater - analysis
Limit of Detection
Luminescence
Luminescent Measurements - instrumentation
Luminescent Measurements - methods
Pesticides - analysis
Physical Chemistry
Plant Sciences
Solid Phase Extraction - instrumentation
Solid Phase Extraction - methods
Water Pollutants, Chemical - analysis
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Summary:A liquid chromatography method with post-column photoinduced chemiluminescence (PICL) detection is proposed for the simultaneous determination of eight carbamate pesticides, namely aldicarb, butocarboxim, ethiofencarb, methomyl, methiocarb, thiodicarb, thiofanox and thiophanate-methyl. After chromatographic separation, quinine (sensitizer) was incorporated and the flow passed through an UV lamp (67 s of irradiation time) to obtain the photoproducts, which reacted with acidic Ce( iv ) and provided a CL emission. The PICL method showed great selectivity for carbamate pesticides containing sulphur in their chemical structure. A solid-phase extraction process increased sensitivity (LODs ranging from 0.06 to 0.27 ng mL −1 ) and allowed the carbamate pesticides in surface and ground water samples to be determined, with recoveries in the range 87–110% (except for thiophanate-methyl, whose recoveries were between 60 and 75%). The intra- and inter-day precision was evaluated, with RSD ranging from 1.1 to 7.5% and from 2.6 to 12.3%, respectively. A discussion about the PICL mechanism is also included.
ISSN:1474-905X
1474-9092
DOI:10.1039/c6pp00056h