气相色谱-质谱法测定塑料食品包装材料中4种有机锡

Determination of the Four Organotin Compounds in Plastic Food Packing Materials by Gas Chromatography-mass Spectrometry

建立了气相色谱-质谱法测定塑料食品包装材料中4种有机锡（二甲基锡、三甲基锡、二乙基锡和-丁基锡）的分析方法。塑料食品包装材料样品经四氢呋喃溶解，甲醇沉淀杂质大分子后高速离心过滤，有机锡与四乙基硼酸钠反应生成有机锡的乙基衍生物，经正己烷萃取后，采用气相色谱-质谱法进行定性定量分析。在试验选定的最佳条件下，4种有机锡的线性范围在0．10～10mg,／L之间，相关系数均大于为0．999，方法检出限为0．2—0．3mg／kg之间，样品加标回收率为56．5％～109．4％，相对标准偏差小于12．6％。

A method for the determination of 4organotin compounds （ DMT, TMT, DET, MBT） in plastic food packing materials was developed by gas chromatography-mass spectrometry （GC-MS）. The sample of plastic food packaging material was dissolved by tetrahydrofuran and the polymer in the sample was precipita- ted with methanol, and then high speed centrifugation and filtration, the organictin and tetraethyl borate sodium reaction generated organictin ethyl derivative. The ethyl derivatives of organtin compounds were extracted with nhexane and then qualitatively and quantitatively analyzed by gas chromatography-mass spectrometry. Under the optimal condition of determination ,the linear calibration curve was obtained in the range of 0.10 -10mg/ L with a correlation coefficient above 0. 999. The limits of quantification in the range of 0.2 - 0.3 mg/kg and the average recoveries were in the range of 56.5% -109.4% for 4 organotins with the relative standard devia- tions below 12.6%. This method is accurate and sensitve, and it is suitable for the analysis of organotins in plastic food packing materials.