植物油中邻苯二甲酸酯含量测定结果的不确定度评定  

Uncertainty Evaluation of the Determination of Phthalic Acid Esters in Vegetable Oil

作　　者：李建兵 张辉珍 李惠颖 王晓滨 李昭勇 

机构地区：[1]青岛市产品质量监督检验所,山东青岛266061 [2]青岛市产品质量检验技术研究所,山东青岛266061

出　　处：《化学分析计量》2012年第6期9-13,共5页Chemical Analysis And Meterage

基　　金：山东省科技发展计划项目(2011GFS12005)

摘　　要：依据GB/T 21911–2008《食品中邻苯二甲酸酯的测定》,采用GPC净化在线浓缩、气相色谱–质谱法测定植物油中的邻苯二甲酸酯类增塑剂。参照JJF1059–1999《测量不确定度的评定与表示》,以测定花生油中邻苯二甲酸二(2-乙基)己酯(DEHP)为例,对整个测量过程中不确定度的来源进行了分析,并对不确定度各个分量进行了评定和合成,取包含因子k=2(约95%置信概率),花生油中DEHP含量为11.8 mg/kg时,扩展不确定度U=1.2 mg/kg。结果表明,随机效应和曲线拟合是影响邻苯二甲酸酯检测过程中的主要因素。Phthalate esters in vegetable oil were determined by GC-MS through GPC clean up and on-line preconcentration according to GB/T 21911-2008 ＂Determination of Phthalate Esters in Foods＂. According to JJF 1059-1999 ＂Evaluation and Expression of Uncertainty in Measurement＂, bis（2-ethylhexyl）phthalate （DEHP） in peanut oil was taken for instance, the sources of uncertainty in the whole process of measurement were analyzed, each component of uncertainty was estimated and combined. The results showed that the expanded uncertainty U=l.2 mg / kg, as the concentration of DEHP was 11.8 mg/kg with the coverage factor k=-2 （the confidence probability was 95%）. The random effect and curve fitting were the mainly influenced factors in PAEs determining process.

关 键 词：植物油 不确定度 邻苯二甲酸酯 邻苯二甲酸二(2-乙基)己酯 

分 类 号：O657.71[理学—分析化学]