Search

A sensitive method for the quantification of 11 pesticides in sugar samples to the μg kg −1 level has been developed. These pesticides are often used in an agricultural context. A simple solvent extraction followed by selective analysis using a gas chromatography–mass spectrometric method was used. This method was accurate (⩾99%) as it possesses limits of detection in the 0.1-μg kg −1 range, and the coefficients of variations are less than 15% at the low μg kg −1 end of the method’s linear range. The percent recovery of all the pesticides at the lowest levels of detection ranges from 82% to 104%. This method was used for the quantification of pesticides in sugar samples collected from different factory outlets from different parts of India. In this study, 27 refined sugar samples were analysed in which one sample showed a detectable level of the chlorpyrifos pesticide. This study showed that Indian sugar is free from the commonly-used pesticides at the low μg kg −1 levels.

A Quick Easy Cheap Effective Rugged and Safe (QuEchERS) extraction was developed and followed by selective analysis using a liquid chromatography-mass spectrometry method for the quantification of eighteen pesticides in vegetable samples. This method was accurate (⩾99.5%), and it exhibited limits of detection and quantification values in the 0.006-0.091 and 0.020-0.314μgkg-1 ranges, respectively. Furthermore, the coefficients of variations (⩾0.9999) were less than 1% at the low μgkg-1 end of the method. Mean recoveries ranged between 94% and 102%, and relative standard deviations were below 10%. Based on these results, the methodology was proven to be highly efficient, robust, and suitable for monitoring the maximum residue limits (MRL) compliance of a wide range of commodity/pesticide combination. This method was successfully applied to the analysis of vegetable samples that were collected from different government farmers' markets and street shops in urban areas. The presence of target pesticides was found in the range of 0.016 and 50.85μgkg-1.