摘要
This study analyzed the sources of uncertainty during the determination of polybrominated biphenyls （PBBs） and polybrominated diphenyl ethers （PBDEs） contents in food packaging bags and calculated the uncertainty introduced in every step of the measurement,finally gave the combined relative standard uncertainty and expanded uncertainty.The results revealed that the resulting combined relative standard uncertainty was determined as 0.069 and the expanded uncertainty as 0.14 at confidence probability p=95％,coverage factor k=2,by following the methods described in GB/Z 21276-2007 ＂Determination of Restricted Substances-Polybrominated Biphenyls and Polybrominated Diphenyl Ethers in Electrical and Electronic Equipment＂.The measured value of PBDE-4 content in the composite food packaging bag X=0.42 mg/kg,so the real content of PBDE-4 was （0.42±0.14） mg/kg.
该研究分析了气相色谱质谱法测定食品包装袋中多溴联苯和多溴联苯醚含量的不确定度来源,并对各环节引入的不确定度进行了计算,得出合成的相对标准不确定度及扩展不确定度。结果表明,使用GB/Z 21276-2007《电子电气产品中限用物质多溴联苯(PBBs)、多溴二苯醚(PBDEs)检测方法》所得合成标准不确定度为0.069,在置信概率p=95%、包含因子k=2时,扩展不确定度为0.14;加标后的复合食品包装袋中PBDE-4含量为X=0.42 mg/kg,复合食品包装袋中四溴联苯醚的含量为(0.42±0.14)mg/kg。
