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Comparison of Negative Chemical Ionization and Electron Impact Ionization in Gas Chromatography–mass Spectrometry of Endocrine Disrupting Pesticides by Renáta Húšková; Eva Matisová; Ľubomír Švorc; Ján Mocák; Michal Kirchner is a scholarly article available to read on EtoBox.

What is Comparison of Negative Chemical Ionization and Electron Impact Ionization in Gas Chromatography–mass Spectrometry of Endocrine Disrupting Pesticides about?

The study of pesticide residues belonging to endocrine disrupting chemicals (EDCs) (23 analytes of different chemical classes -organochlorines, organophosphates, pyrethroids, dicarboximides, phtalamides, dinitroanilines, pyrazole, triazinone) in apple matrix with conventional capillary GC-NCI-MS (with methane as reagent gas) in comparison to EI ionization is presented. For sample preparation QuECh-ERS method was applied. The lowest calibration levels (LCLs) for all pesticides were determined in both modes. Calibration in the NCI mode was performed at the concentration levels from 0.1 to 500 g kg -1 (R 2 > 0.999) and for EI in the range from 5 to 500 g kg -1 (R 2 > 0.99). From LCLs the instrumental limits of detection (LODs) and quantification (LOQs) were calculated. Chemometric study of pesticide signals in two MS modes was performed. Repeatability of all measurements, expressed by the relative standard deviations of absolute peak areas was better than 10% for the majority of compounds. Significantly lower values were obtained for the NCI mode.

Author

Renáta Húšková; Eva Matisová; Ľubomír Švorc; Ján Mocák; Michal Kirchner

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

2009

Language

EN