气相色谱法测定稳定同位素^13(C)标记辛酸纯度的不确定度评定  

Evaluation of Uncertainty in the Determination of Purity of Stable Isotope^13(C)Labelled Octanoic Acid by Gas Chromatography

作　　者：赵诚 孙雯 袁璋晶 ZHAO Cheng;SUN Wen;YUAN Zhangjing(Shanghai Research Institute of Chemical Industry Co.,Ltd./Shanghai Professional Technology Service Platform for Detection and Application Development of Stable Isotope,Shanghai 200062,China)

机构地区：[1]上海化工研究院有限公司/上海市稳定同位素检测及应用研发专业技术服务平台,上海200062

出　　处：《肥料与健康》2023年第1期65-69,共5页Fertilizer & Health

基　　金：上海市科委技术标准专项(19DZ2204200);普陀区科技研发平台项目(2021SX02)。

摘　　要：根据行业标准《稳定同位素^13(C)标记的辛酸》(HG/T 5941—2021),采用气相色谱法测定稳定同位素^13(C)标记的辛酸纯度,对测定过程中的不确定度来源进行了分析,主要为标准溶液配制、标准曲线拟合、样品制备和样品测量重复性等。按《测定不确定度评定与表示》(JJF 1059.1—2012)的规定进行不确定度计算,稳定同位素^13(C)标记的辛酸纯度的测量不确定度来源主要为标准溶液配制与标准曲线拟合,其合成标准不确定度为0.817%,扩展不确定度为1.6%,测定结果为99.0%±1.6%(k=2)。According to the industry standard Stable isotope^13(C)labelled Octanoic acid(HG/T 5941—2021),the purity of octanoic acid labeled with stable isotope^13(C)is determined by gas chromatography,and the sources of uncertainty in the determination process are analyzed,mainly including standard solution preparation,standard curve fitting,sample preparation and sample measurement repeatability.The uncertainty is calculated according to the provisions of Evaluation and Expression of Uncertainty in Measurement(JJF 1059.1—2012).The source of uncertainty in the measurement of octanoic acid purity labelled with stable isotope^13(C)is mainly the preparation of standard solution and the fitting of standard curve.The combined standard uncertainty is 0.817%,the expanded uncertainty is 1.6%,and the measurement result is 99.0%±1.6%(k=2).

关 键 词：稳定同位素 ^13(C)标记辛酸 气相色谱法 不确定度 

分 类 号：O657.71[理学—分析化学]