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Behaviour of carbamate pesticides in gas chromatography and their determination with solid‐phase extraction and solid‐phase microextraction as preconcentration steps
Author(s) -
CarabiasMartínez Rita,
GarcíaHermida César,
RodríguezGonzalo Encarnación,
RuanoMiguel Luis
Publication year - 2005
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200400047
Subject(s) - chromatography , solid phase microextraction , chemistry , detection limit , gas chromatography , ultrapure water , solid phase extraction , extraction (chemistry) , propoxur , carbofuran , carbaryl , sample preparation , gas chromatography–mass spectrometry , mass spectrometry , pesticide , materials science , agronomy , biology , nanotechnology
This work reports a study of the chromatographic behaviour of seven carbamate pesticides (aldicarb, carbetamide, propoxur, carbofuran, carbaryl, methiocarb, and pirimicarb) by gas chromatography‐mass spectrometry (GC‐MS). Variables such as injector temperature, solvent, injection mode, and the degree of ageing of the chromatographic column were studied. One of the aims of this work was to achieve a controlled decomposition of carbamates by a solid‐phase microextraction (SPME) preconcentration step with a polyacrylate fibre in order to obtain reproducible chromatographic signals of the degradation products. Optimisation of the SPME process was accomplished by means of experimental design. Several methods using ultrapure water were developed with different preconcentration configurations: SPME‐GC‐MS, SPE followed by SPME‐GC‐MS, and SPE plus GC‐MS. For all the pesticides studied, method detection limit (MDL) values below 0.1 μg L –1 were reached in at least one of the proposed configurations.