Dispersive solid-phase extraction for the determination of organochlorine pesticides in fruit juice samples using iron-doped zinc oxide nanoparticles supported with silica as a sorbent

An efficient analytical method has been developed based on dispersive solid-phase extraction followed by gas chromatography-mass spectrometry for the determinations of 13 organochlorine pesticides in fruit juice samples. In this method, dispersive solid phase extraction was used for the extraction of target analye using iron-doped zinc oxide nanoparticles supported with silica as a sorbent. Different experimental parameters affecting the extraction efficiencies the proposed method were carefully optimized. Under the optimum conditions, the calibration graphs were linear in the concentration range of 0.6-100 ng/mL with coefficients of determinations in the range of 0.9927-0.9991. The limits of detection and quantification determined as 3 and 10 times the signal-to-noise ratio were in the range of 0.01-0.03 and 0.6-1.0 ng/mL, respectively. Intra- and inter-day precision studies of the proposed method, expressed as relative standard deviations, were in the range of 2.1%-9.2% and 2.2%-9.7%, respectively. The recoveries of the spiked fruit juices samples were in the range of 81.4%-105.1% with the corresponding relative standard deviations ranging from 1.0%-8.8%. In general, the proposed method demonstrated satisfactory analytical performance. Thus,it could be used as simple and attracive alternative method for the extraction of organochlorine pesticides from fruit juice sample and other related matrices.