Exposure Assessment for Some Pesticides through Rice Consumption in Iran Using a Multiresidue Analysis by GC-MS

In communities which consume rice as main food, importance of risk assessment forcontaminants is always taken into consideration by health authorities. The present study isan attempt for monitoring of 56 pesticides from different chemical groups in rice samplescollected from local markets in Tehran and estimation of daily intake of interested pesticidesthrough this monitoring. A valid method based on spiked calibration curves and QuEChERSsample preparation was developed for determination of pesticides residue in rice by GC/MS.The analytical results of the proposed method were in good agreement with the proficiency test(FAPAS 0969). One-hundred-thirty-five rice samples were analyzed and 11 pesticide residueswere found in 10.4% of the samples. Of which 5.2% were contaminated with unregulatedpesticides. None of the samples, which were contaminated with regulated pesticides, hadcontamination higher than maximum residue limit. The mean estimated dose (ED) wascalculated with respect of mean of contamination and mean daily consumption of rice. ED ofthe found pesticides is much lower than the related ADIs.