Estimation and correction of matrix effects in gas chromatographic pesticide multiresidue analytical methods with a nitrogen-phosphorus detector

The assessment of matrix effects in the quantification of organophosphorus pesticides in fruit and vegetables by GC-NPD, were studied applying ANCOVA. Calibration curves prepared in solvent were compared with calibration curves prepared in a blank matrix extract for eight different commodities, esta...

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Bibliographic Details
Published inAnalyst (London) Vol. 127; no. 8; pp. 1038 - 1044
Main Authors EGEA GONZALEZ, F. J, HERNANDEZ TORRES, M. E, CUADROS RODRIGUEZ, L, ALMANSA LOPEZ, E, MARTINEZ VIDAL, J. L
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.08.2002
Subjects
Biological and medical sciences
Calibration
Chromatography, Gas - instrumentation
Food Analysis - methods
Food industries
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
Pesticide Residues - analysis
Gas chromatography
Analysis method
Residue
Pesticides
Matrix effect
Organophosphorus compounds
Fruit vegetable
Quantitative analysis
Chemical contamination
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Summary:The assessment of matrix effects in the quantification of organophosphorus pesticides in fruit and vegetables by GC-NPD, were studied applying ANCOVA. Calibration curves prepared in solvent were compared with calibration curves prepared in a blank matrix extract for eight different commodities, establishing whether the matrix induces systematic or proportional errors in the quantification of the pesticides. In such cases correction functions were obtained and validated by quantifying spiked samples using solvent calibrations and applying the correction functions to the data obtained. The results were compared with those obtained by quantification using matrix-matching calibrations and with those from 100% recovery experiments. It was found that the matrix effects can be avoided using the correction functions. Finally the contribution of the correction functions to the uncertainty of the results was estimated as well as their stability during a four month period.
ISSN:0003-2654
1364-5528
DOI:10.1039/b201461k