Fu Shanliang, Zhang Ying,Xiao Jiayong, Li Yongjun, Ding Li, Yan Hongfei

(Technology Center, Hunan Entry-Exit Inspection and Quarantine Bureau, Changsha ,China 410004)

Abstract: An analytical method using the on-line gel permeation chromatography- gas chromatography/mass spectrometry has been developed for the determination of 6 organotin compounds in tea. After acidified by hydrochloric acid, the sample was extracted with acetone-hexane, the crude extract was concentrated, dehydrated, and derivatized by n-pentyl magnesium bromide. Then the derivative was extracted by n-hexane and purified on a Envi-Carb and Florisil solid phase extraction column, and then analysed on an on-line gel permeation chromatographic-gas chromatographic/mass spectrometer(GPC-GC/MS). The recoveries in the spiked sample with standards of 0.01, 0.05 and 0.10 mg/kg were 66.2%～105.6%, and the relative standard deviations were between 2.7%～10.4%. The limits of detection were 0.01 mg/kg. The method is proved to be rapid, easy, accurate, highly sensitive, and can be used for the simultaneous determination of organotin compounds in tea.

Key words: on-line gel permeation chromatography-gas chromatography/mass spectrometry; organotin compounds; solid phase extraction; tea

E-mail: zhangy@hnciq.gov.cn

Analysis and Testing Technology and Instruments, Vol. 16, No. 4, 2010, 262-267.