Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
41, Number 2, February 2003, pp. 92-95
Screening of Pesticides via Solid-Phase Extraction and Gas Chromatography
Atilio Sosa[1], Argelia Lenardón[2], and Maria Liliana
Mattassini[1]
[1]Laboratorio de Evaluación y Control de Contaminantes Ambientale (LECCA),
Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán
(FACET_UNT), Av. Independencia 1800 CP (4000) and
[2]Instituto para el Desarrollo
Tecnológico de la Industria Química (INTEC), Santa Fé,
Argentina
This work describes an analytical method for the screening of
pesticide residues in water. The developed method identifies and quantitates
a variety of pesticides in water samples such as organochlorine, organophosphate,
chloronitrile, phthalimide, dicarboximide, and triazine. The analytical technique
employed for the extraction and cleanup step involves solid-phase extraction
with C-18 cartridges. The identification and determination of concentration
is carried out with gas chromatography. Two columns of different polarity and
two specific detectors are used. An electron capture detector is used for organochrolorine,
and a thermoinic detector is used for organonitrogen and organophosphate. The
good resolution achieved with the temperature program and the combination of
columns is shown in the chromatograms obtained. The limits of detection, percent
recovery, and their respective standard deviations are determined for each
product. According to the results obtained, this method permits monitoring
of the pesticides mentioned, many of which are moderately to highly toxic to
aquatic organisms.
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