Chinese Journal of Chromatography ›› 2019, Vol. 37 ›› Issue (1): 21-26.DOI: 10.3724/SP.J.1123.2018.09002

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Determination of organo-tin residues in edible vegetable oil by positive chemical ionization-gas chromatography-mass spectrometry

WANG Hong1, SHEN Weijian1, WU Bin1, YU Keyao1, JIANG Shan1, LU Huiyuan1, HU Guoshen1, WANG Yiqian1, GAO Ling1, SONG Jieming2   

  1. 1. Animal, Plant and Food Inspection Center, Nanjing Customs, Nanjing 210019, China;
    2. Nanjing No.1 Middle school, Nanjing 210001, China
  • Received:2018-08-31 Online:2019-01-08 Published:2014-11-29
  • Supported by:

    Nanjing Customs Research Project (Nos. 2018KJ38, 2017KJ05).

Abstract:

For the determination of organo-tin residues in edible vegetable oil, a method was developed based on gas chromatography-mass spectrometric (GC-MS) with positive chemical ionization (PCI). The edible oil samples were first dissolved by cyclohexane-ethyl acetate (1:1, v/v), and then purified by gel permeation chromatography (GPC). After derivatization by sodium tetraethylborate, the samples were analyzed by GC-MS with PCI source in the single ion monitor (SIM) mode. The seven organo-tin compounds showed good linear relationships in the range of 20-2000 μg/L and the correlation coefficients exceeded 0.99. The limits of quantitation (LOQs) and the average recoveries of the seven organo-tin compounds were 0.3-1.2 μg/kg and 66.2%-103.2%, respectively, and the relative standard deviations were less than 11.5% at three spike levels (0.05, 0.10, and 0.20 mg/kg). The method showed good linearity and high sensitivity and can be used for the determination of organo-tin residues in edible vegetable oil.

Key words: edible vegetable oil, gas chromatography-mass spectrometry (GC-MS), organo-tin, positive chemical ionization (PCI)

CLC Number: