塑料玩具中短链氯化石蜡含量检测

Determination of Short Chain-chlorinated Paraffin in Plastic Toys

建立了快速检测塑料玩具中短链氯化石蜡(SCCPs)的气相色谱-质谱联用法(GC-MS)。样品采用液液萃取法处理,对萃取温度、萃取方式、萃取溶剂3种条件分别进行了考察。萃取液经浓缩并过滤后定容进样,GC-MS总离子流图确证、定性,外标法定量。结果表明,短链氯化石蜡的线性范围为0.5~100 mg/L,标准曲线呈现良好的线性关系,相关系数为0.999,回收率为85.4%~90.9%,相对标准偏差(RSD)为4.34%~7.45%;该方法简便快捷、灵敏度高,检出限为0.052 4~0.197 mg/L;对3种氯含量的短链氯化石蜡的谱图特征进行分析,可作为判定玩具样品中短链氯化石蜡含氯量种类判定的方法;用该方法在玩具塑料壳中检出SCCPs主要为含氯量51.5%、含氯量55.5%两类的混合物,含量在24.42~52.46 mg/kg;该方法满足对儿童塑料玩具中SCCPs的分析检测。

A study on short chain-chlorinated paraffins(SCCPs) in plastic toys was conducted by means of a GC-MS detection technique, and the extraction temperature, procedure and solvent were optimized. The total ion current confirmation, qualitative and quantitative ion analyses and GC-MS detection for the content of SCCPs in plastic toys were also carried out. The results indicated that there was a good linear relationship for SCCPs, and its linear correlation coefficient for the calibration curves reached 0.999 9. The detection limit was in the range of 0.052 4~0.197 mg/L, and the recover rate reached 85.4 %~90.9 %. The chromatographic analysis for the SCCPs with three different chlorine contents could be used for the confirmation of chlorine species in SCCPs. This method is simple, rapid, highly sensitive and quantitatively accurate. The results indicated that this method could be used for the measurement of plastic toys contained 24.42~52.46 mg/kg of SCCPs.