Abstract: A new GC-FPD method for the simultaneous determination of dimethylltin (DMT), trimethyltin (TMT) and triethyltin (TET) in Chinese liquor was developed. Organotins were derivatized with NaBEt4, extracted by liquid-liquid extraction with n-hexane, and analyzed by gas chromatography-flame photometry (GC-FPD). The developed calibration curve sof DMT, TMT and TET were all linear in the range of 0.2－2.5 mg/L, with correlation coefficients of 0.9992, 0.9980 and 0.9991, respectively. The limits of detection for three organotins were 0.0161, 0.0167 mg/L and 0.0110 mg/L, respectively. The average recovery rates at spike levels of 0.5 mg/L and 2.0 mg/L were in the range of 67.6%－103.5% with RSD between 5.14% and 18.46%. This new method has been applied for the determination of organotin compounds in wine with satisfactory results.

Key words: dimethyltin, trimethyltin, tiethyltin, GC-FPD, Chinese liquor