title: [Determination of buprofezin, methamidophos, acephate, and triazophos residues in Chinese tea samples by gas chromatography].
abstract: A method has been developed for the simultaneous determination of buprofezin, methamidophos, acephate and triazophos residues in Chinese tea samples. The pesticide residues were extracted from tea samples with a mixture of ethyl acetate and n-hexane (50:50, v/v) at 45 degrees C. The extracts were subsequently treated with a column packed with 40 mg of active carbon by gradient elution with ethyl acetate and n-hexane. Buprofenzin and the three organophosphorus pesticides were analyzed by gas chromatography using a DB-210 capillary column and a nitrogen-phosphorus detector. The recoveries for spiked standards were 73.4%-96.9%. The relative standard deviations were all within 4.63%. The limits of quantitation (3sigma) in the tea samples were about 7.0-12.0 microg/kg.
authors.affiliation: College of Oceanography & Environmental Science, Xiamen University, Xiamen 361005, China. zhang5117427@163.com
authors.forename: Shuiba
authors.initials: S
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Yi
authors.forename: Jianglei
authors.initials: J
authors.lastname: Ye
authors.forename: Wenhui
authors.initials: W
authors.lastname: Zheng
authors.forename: Xueqin
authors.initials: X
authors.lastname: Cai
authors.forename: Zhenbin
authors.initials: Z
authors.lastname: Gong
mesh_terms: D002849:Chromatography, Gas; D063086:Organothiophosphates / Q000032:analysis; D009946:Organothiophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D063088:Phosphoramides; D013662:Tea / Q000737:chemistry*; D013829:Thiadiazines / Q000032:analysis*; D014230:Triazoles / Q000032:analysis
chemical_list: D063086:Organothiophosphates; D009946:Organothiophosphorus Compounds; D010573:Pesticide Residues; D063088:Phosphoramides; D013662:Tea; D013829:Thiadiazines; D014230:Triazoles; C083997:buprofezin; C001969:acephate; C012584:triazophos; C014655:methamidophos