In this study, magnetic graphene was used as modified quick, easy, cheap, effective, rugged and safe
(QuEChERS) adsorbent for the determination of organochlorine pesticide (OCPs) residues in tobacco.
To achieve the optimum conditions of modified QuEChERS procedure toward target analytes, several
parameters affecting the clean-up efficiency including the amount of the adsorbent and clean-up time
were investigated. Under the optimized conditions, a method for the determination of 26 OCPs residues
in tobacco was established by coupling the modified QuEChERS procedure to on-line gel permeation
chromatography–gas chromatography–tandem mass spectrometry (on-line GPC–GC–MS2). The limits of
detection of proposed method for 26 OCPs residues ranged from 0.01275 to 3.150 ng/g. And good linearities
of the proposed method were obtained with coefficients of determination (R2) greater than 0.9985
for all target analytes. Good reproducibility of method was obtained as intra- and inter-day precisions,
the relative standard deviations were less than 11.1 and 15.0%, respectively. The apparent recoveries
were in the range of 64–126% at different concentrations for real samples. Compared with the reported
methods for the determination of OCPs residues in tobacco, the proposed method has the advantages of
simple to operate, low cost and high clean-up ability. Finally, the method was successfully applied to the
analysis of OCPs residues in real samples.