顶空-气相色谱法测定化妆品中乙苯含量的不确定度评定  

Uncertainty Evaluation of Quantitative Measurement of Ethylbenzene in Cosmetic Products by Headspace-Gas Chromatography

作　　者：薛晓康[1] 李晓宇 丁卯[1] 

机构地区：[1]上海化工研究院检测中心,上海200062

出　　处：《环境科学导刊》2018年第1期71-75,81,共6页Environmental Science Survey

基　　金：十三五国家重点研发计划课题(2016YFC0801304)

摘　　要：依据《化妆品安全技术规范》(2015年版)测定化妆品中乙苯含量。取置信概率P=95%,k=2,乙苯含量为19.47 mg/kg±3.18 mg/kg。测量结果的不确定度评定表明在样品溶液浓度测量过程中标准溶液配制和标准曲线拟合引入的不确定度所占比例较大。因此,在日常检测中可优化溶液配制的方法、选择合适的体积量取仪器,不断提高操作人员的熟练程度,以减小测量不确定度,提高测量结果的质量。The Ethylbenzene quantity was measured according to ＂Safety and Technical Standards for Cosmetics （ Version 2015 ） ＂. The sample was diluted by water and introduced in gas chromatography machine after gas - liq- uid equilibrium in headspace and detected by flame ionization detector （FID）. The quantitative measurement was performed by peak areas. The quantity of Ethylbenzene was 19.47mg/kg ＋ 3.18mg/kg in conditions that the confi- dence probability was taken as P = 95 %, k = 2. The uncertainty of measurement of this experiment showed that the preparation of the standard solutions and the standard curve fitting led to more uncertainties in measurement of con- centration of solutions. Therefore, optimization of the preparation of solutions, choice of a suitable tool for liquid measurement and improvement of operator＇s technique would reduce the uncertainty of measurement and improve the quality of the result of measurement.

关 键 词：顶空-气相色谱仪 环境监测 化妆品 乙苯 不确定度评定 

分 类 号：X83[环境科学与工程—环境工程]