Matrix induced effect on recovery of pesticides in multi-residue analysis from Brinjal

Focus here is on various sources of variability, analyse the efficiency of pesticide recovery and examine the reproducibility of the results in a vegetable matrix-like brinjal. The co-extracts recovered along with the pesticide while solvent extraction from plant material leads to one of the most common problems which influence the reproducibility of pesticide residue analysis results in a matrix-induced enhancement or diminishing effect, which can be taken care of when a matrix match calibration is applied while processing. In the present study, this matrix-induced effect is conspicuously observed for pesticide Heptanophos. Extremely high percentage recovery of 182.78% and 284.96% are obtained in 5g samples for brinjal processed under two different temperature i.e. with dry ice and under ambient conditions. The same effect is also observed in 15g analytical portion of brinjal dry ice showed 113.88% recovery of pesticide, these result clearly reveals co-extractives mediated matrix-induced enhancement effect.