气相色谱-质谱法测定自热食品接触用塑料制品所用着色剂中14种多氯联苯

Determination of 14 Polychlorinated Biphenyls in Colorants for the Plastics Used in Self-heating Food Contact Materials by GC-MS

该文建立了同时测定自热食品接触用塑料制品所用着色剂中的14种多氯联苯的气相色谱-串联质谱法。样品中的多氯联苯经有机溶剂超声提取,用浓硫酸磺化,气相色谱-串联质谱法分析,外标法定量。结果表明,14种多氯联苯在质量浓度为0.5~5μg/L的范围内均线性良好,相关系数(R^(2))均大于0.99。14种多氯联苯的检出限均为5μg/kg,定量限均为25μg/kg。当添加量为5、10、25μg/kg时,14种多氯联苯在荧光红中的回收率为81.03%~105.72%之间,相对标准偏差(RSD)在1.51~10.52之间;在荧光黄中的回收率为80.11%~108.44%之间,RSD在0.69~11.10之间;在荧光蓝中的回收率为81.07%~102.56%之间,RSD在0.72~10.80之间;在荧光绿中的回收率为80.26%~109.37%之间,RSD在1.12~11.41之间;在荧光紫中的回收率为80.15%~105.80%之间,RSD在1.21~10.89之间。该方法快速准确,能够为自热食品接触材料着色剂安全性评价作技术参考。

A gas chromatography-mass spectrometry(GC-MS)method was developed for simultaneous determination of 14 polychlorinated biphenyls(PCBs)in colorants for plastics used in self-heating food for food contact products.The PCBs in the sample were extracted by ultrasound-assisted extraction with organic solvent,sulfonated with concentrated sulphuric acid,determined by GC-MS,and quantified with external standards.The results showed that 14 PCBs exhibited good linear relationships in the concentration range of 0.5~5μg/L,with the correlation coefficients(R^(2))all higher than 0.99,the limits of detection(LODs)all being 0.1 mg/kg,and the limits of quantification(LOQs)all being 0.25 mg/kg.When the spiking concentration was 5μg/kg,10μg/kg or 25μg/kg,the recoveries of 14 PCBs in fluorescent red ranged from 81.03%to 105.72%,with the relative standard deviations(RSDs)ranging from 1.51 to 10.52;the recoveries of 14 PCBs in fluorescent yellow ranged from 80.11%to 108.44%,with the RSDs ranging from 0.69 to 11.10;the recoveries of 14 PCBs in fluorescent blue ranged from 81.07%to 102.56%,with the RSDs ranging from 0.72 to 10.80;the recoveries of 14 PCBs in fluorescent green ranged from 80.26%to 109.37%,with the RSDs ranging from 1.12 to 11.41;the recoveries of 14 PCBs in fluorescent violet ranged from 80.15%to 105.80%,with the RSDs ranging from 1.21 to 10.89.This method is rapid and accurate,and can be used as a technical reference for safety evaluation of colorants used in self-heating food contact materials.