DOI: 10.3724/SP.J.1123.2018.09002

Chinese Journal of Chromatography (色谱) 2019/37:1 PP.21-26

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

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

ReleaseDate:2019-01-31 09:03:36

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