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Quintozene, pentachloronitrobenzene (PCNB) is a contact fungicide for control of soilbornephytopathogenic fungi during cultivation of diverse crops. It was introduced to agricultural use around 1930’sas a substitute for mercurial disinfectants. Although quintozene had been first registered in Korea on 1969.However, now it was banned to use due to its high residue levels in selected harvest products. Also, highpossibility is expected that the residue may be contained in imported agricultural commodities as it is stillused widely over the world. Therefore, this study was conducted to establish a determination method forquintozene residue in crops using GC/ECD/MS. Quintozene residue was extracted with acetonitrile fromrepresentative samples of five raw products which comprised hulled rice, soybean, Kimchi cabbage, greenpepper, and apple. The extract was diluted with saline water, and n-hexane partition was followed to recoverquintozene from the aqueous phase. Florisil column chromatography was additionally employed for finalclean up of the extract. The quintozene was quantitated by GLC with ECD, using a DB-1 capillary column.The crops were fortified with quintozene at 3 levels per crop. Mean recoveries ranged from 79.9% to 102.7%in five representative agricultural commodities. The coefficients of variation were less than 4.3%. Quantitativelimit of quintozene was 0.004 mg/kg in representative five crop samples. A GC/MS with selected-ionmonitoring was also provided to confirm the suspected residue. Therefore, this analytical method wasreproducible and sensitive enough to determine the residue of quintozene in agricultural commodities.Key words GC-ECD/MS, Quintozene, Residue

Determination of Quintozene Residues in Agricultural Commodities Using GC-ECD/MS