Effects of QuEChERS cleanup and blank matrix quantification on reducing matrix effects of various pesticides in celery
Objective To determine the effect of purification and blank matrix quantification on reducing matrix effects in celery.Methods QuEChERS method was used to purify and no-purify the celery matrix to compare the effect of purification on reducing the effect of pesticide matrix.In addition,the solvent standard solution and blank matrix standard solution were used for 42 pesticides to spiked recovery tests at three levels of 0.02,0.05,and 0.10 mg/kg,to compare and study the effect of blank matrix solution quantification on reducing matrix effects.Results For methamidophos,acephate,monocrotophos,profenofos,saphophos and fenthion sulfone with strong matrix effects,the matrix effects were reduced by 90.0％to 220％after purification,butthe matrix effect of other pesticides was not significantly improved after purification.Howeve,the recovery rate of the matrix standard solution for 42 pesticides at 3 levels was in the range of 60.3％to 108.7％,while the calibration range of the solvent standard solution was in the range of 55.0％to 609.6％.Theresults indicated that the matrix calibration data was closer to the true value,which could effectively reduce the matrix effect of celery.Conclusion Due to the ubiquity of matrix effects,the samples should be cleaned upand be quantified with a suitable matrix standard solution to ensure the accuracy of the data in the actual detection work.
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