气相色谱-质谱法测定热塑性弹性体中的多环芳烃

建立了一种简单、准确的测定热塑性弹性体中16种多环芳烃(PAHs)的气相色谱-质谱(GC-MS)方法。考察了样品制备、萃取溶剂、萃取方法、时间以及温度对厂家制备的阳性热塑性弹性体样品中PAHs提取效率的影响,确定了萃取条件和方法。样品经甲苯超声萃取、浓缩后用环己烷溶解、二甲亚砜液液萃取净化后采用GC-MS进行分析,内标法定量。通过对不同材质阳性热塑性弹性体样品的加标回收、精密度试验等对建立的方法进行评价,16种PAHs的平均回收率为70%～117%,精密度为0.2%～10.8%。该方法适合于热塑性弹性体中PAHs的测定。

Determination of polycyclic aromatic hydrocarbons in thermoplastic elastomer by gas chromatography-mass spectrometry

A simple and accurate method for the determination of 16 polycyclic aromatic hydrocarbons (PAHs) in thermoplastic elastomer by gas chromatography-mass spectrometry (GC-MS) has been developed. The effects of various operational parameters (e. g. sample pretreatment, extraction solvent, extraction method, extraction temperature, extraction time, etc) on the extraction efficiency were carefully investigated by analyzing different kinds of positive PAHs thermoplastic elastomer samples made by the manufacturer. The samples were extracted ultrasonically with toluene, concentrated to about 1 mL and then redissolved by cyclohexane. After being purified by dimethyl sulfoxide liquid-liquid extraction, 16 PAHs in the sample were analyzed by GC-MS and quantified by internal standard method. Different kinds of thermoplastic elastomer materials and products were analyzed by this method with the recoveries ranged from 70% to 117% and the relative standard derivations between 0.2% and 10.8%. The method is acceptable for the determination of PAHs in thermoplastic elastomer materials and products.