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Development of Analytical Method for the Determination and Identification of Unregistered Pesticides in Domestic for Orange and Brown Rice(I) -Chlorthal-dimethyl, Clomeprop, Diflufenican, Hexachlorobenzene, Picolinafen, Propyzamide-
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 Title & Authors
Development of Analytical Method for the Determination and Identification of Unregistered Pesticides in Domestic for Orange and Brown Rice(I) -Chlorthal-dimethyl, Clomeprop, Diflufenican, Hexachlorobenzene, Picolinafen, Propyzamide-
Chang, Hee-Ra; Kang, Hae-Rim; Kim, Jong-Hwan; Do, Jung-A; Oh, Jae-Ho; Kwon, Ki-Sung; Im, Moo-Hyeog; Kim, Kyun;
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BACKGROUND: For the safety of imported agricultural products, the study was conducted to develop the analytical method of unregistered pesticides in domestic. The analytical method of 6 pesticides, chlorthal-dimethyl, clomeprop, diflufenican, hexachlorobenzene, picolinafen, and propyzamide, for a fast multi-residue analysis were established for two different type crops, orange and brown rice by GC-ECD and confirmed by mass spectrometry. METHODS AND RESULTS: The analytical method was evaluated to limit of quantification, linearity and recoveries. The crop samples were extracted with acetonitrile and performed cleanup by liquid-liquid partition and Florisil SPE to remove co-extracted matrix. The extracted samples were analyzed by GC-ECD with good sensitivity and selectivity of the method. The limits of quantification (LOQ) range of the method with S/N ratio of 10 was 0.02~0.05 mg/kg for orange and brown rice. The linearity for targeted pesticides were >0.999 at the levels ranged from 0.05 to 10.0 mg/kg. The average recoveries ranged from 74.4% to 110.3% with the percentage of coefficient variation in the range 0.2~8.8% at two different spiking levels (0.02 mg/kg and 0.2 mg/kg, 0.05 mg/kg and 0.5 mg/kg) in brown rice. And the average recoveries ranged from 77.8% to 118.4% with the percentage of coefficient variation in the range 0.2~6.6% at two different spiking levels (0.02 mg/kg and 0.2 mg/kg, 0.05 mg/kg and 0.5 mg/kg) in orange. Final determination was by gas chromatography/mass spectrometry/selected ion monitoring (GC/MS/SIM) to identify the targeted pesticides. CONCLUSION: As a result, this developed analytical method can be used as an official method for imported agricultural products.
Brown rice;GC-ECD;Mass Spectrometry;Multiresidue;Orange;Pesticide;
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