Journal
JOURNAL OF SEPARATION SCIENCE
Volume 40, Issue 6, Pages 1293-1300Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201600942
Keywords
matrix-like effect; pesticide residue analysis; response enhancement
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Funding
- Health and Labour Science Research Grant of the Ministry of Health, Labour, and Welfare, Japan
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In multiresidue pesticide analysis using gas chromatography, it has long been recognized that an increase in the number of pesticides present in a standard solution can result in an enhancement of the peak responses of certain pesticides. Despite being widely acknowledged, this phenomenon has been rarely studied and is poorly understood. In this study, the authors have tentatively called this phenomenon the matrixlike effect and demonstrated it clearly using gas chromatography with tandem mass spectrometry. Five selected pesticides, namely, omethoate, terbufos, malathion, procymidone, and permethrin, and four internal standard candidates, namely, triphenyl phosphate, naphthalene-d(8), phenanthrene-d(10), and fluoranthene-d(10), were used to evaluate the matrix-like effect following the addition of 58, 108, and 166 other pesticides. With the exception of naphthalene-d(8), the responses of all evaluated pesticides and internal standard candidates were dramatically enhanced by the addition of up to 166 coexisting pesticides. The relative response factors of the five pesticides to each internal standard candidate were not constant under the conditions studied, meaning that these internal standard candidates did not adequately compensate for the matrix-like effect, at least for the five evaluated pesticides. The results revealed that the presence of various mixtures of pesticides in standard solutions might act as an unintentional analyte protectant, that is, some sort of troublesome quasi-matrix.
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