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Matrix effects observed during pesticides residue analysis in fruits by GC
Author(s) -
de Sousa Freitas Silvia,
Lanças Fernando M.
Publication year - 2009
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.200900358
Subject(s) - diazinon , pesticide , dimethoate , chemistry , matrix (chemical analysis) , pesticide residue , fenitrothion , chromatography , gas chromatography , parathion methyl , standard addition , chlorothalonil , detection limit , agronomy , biology
Abstract The influence of the sample matrix in the GC‐electron‐capture detection analysis of the pesticides dimethoate, diazinon, chlorothalonil, parathion methyl and fenitrothion in fruits samples has been studied. Experiments have been carried out where the pesticide responses in standard solutions prepared in selected solvent were compared with their response when present in apple, mango, papaya, banana, pineapple and melon extracts. The presence of matrix effects (MEs) and their extent were shown to be simultaneously influenced by several factors (matrix concentration, matrix type, pesticide concentration, analytical range). Pronounced MEs were observed particularly for dimethoate and diazinon in all matrices tested; in lower concentrations, all pesticides presented significant ME. The other pesticides presented variable ME. Higher ME enhancement was detected at lower pesticide concentration levels of and/or at higher matrix concentration solutions. The ME detected for fenitrothion, in the analytical range evaluated, were dependent on matrix type. For each pesticide, solvent and matrix‐matched calibrations were compared for all fruit samples, and it could be concluded that quantitation based on standard solutions prepared in blank matrix extract (matrix‐matched calibration) should be used to compensate the MEs and to obtain more accurate results for the pesticides studied.