基于不确定度评估研究气相色谱法检测1,2-丙二醇含量的关键控制点  

Critical Control Points of Gas Chromatography Method for the Determination of 1,2-propanediol Based on the Evaluation of Uncertainty

作　　者：刘慧玲 吴东坡 刘蓓蕾 康占省 倪旺 郗海东 LIU Hui-Ling;WU Dong-Po;LIU Bei-Lei;KANG Zhan-Sheng;NI Wang;XI Hai-Dong(Coal Inspection Technology Center of Qinhuangdao Customs,Qinhuangdao 066000;Technology Center of Shijiazhuang Customs,Shijiazhuang 050051)

机构地区：[1]秦皇岛海关煤炭检测技术中心,秦皇岛066000 [2]石家庄海关技术中心,石家庄050051

出　　处：《中国口岸科学技术》2024年第10期72-77,共6页China Port Science and Technology

摘　　要：为提高实验室检测结果的准确性,本文以实验室饮料样品作为测试样品,采用气相色谱法对1,2-丙二醇进行测定,通过研究具体试验过程,确定不确定度来源,分析和评定标准溶液配制、标准曲线拟合、样品称量和测量重复性等因素。结果显示,配置标准工作溶液、标准曲线拟合、样品称量和测量重复性对不确定度都有贡献,其中,配置标准工作溶液和标准曲线拟合引入的不确定度贡献最大,贡献率为68.86%和30.80%,样品称量引入的不确定度可以忽略不计。气相色谱法测定1,2-丙二醇的关键控制点是标准工作溶液的配置过程,在日常检测过程中应采用规范标准溶液配制操作过程,尽量简化溶液配制步骤、使用校准玻璃容器等措施保证检测结果的准确性和科学性。研究结果有利于提升1,2-丙二醇的检测质量,为精准检测提供新思路。In order to improve the accuracy of laboratory test results,this paper took laboratory beverage samples as test samples,and used gas chromatography to determine 1,2-propylene glycol.By studying the specific test process,the source of uncertainty was determined,and factors such as the preparation of standard solution,standard curve fitting,sample weighing and measurement repeatability were analyzed and evaluated.The results showed that standard working solution configuration,standard curve fitting,sample weighing and measurement repeatability all contributed to the uncertainty,among which standard working solution configuration and standard curve fitting contributed the most,with the contribution rates being 68.86%and 30.80%respectively,and the uncertainty caused by sample weighing was negligible.The critical control point of the determination of 1,2-propylene glycol by gas chromatography was the configuration process of the standard working solution.In the daily testing process,the preparation operation process of the standard solution should be standardized,the steps of the solution preparation should be simplified as far as possible,and the calibration glass container should be used to ensure the accuracy and scientificity of the test results.The results can improve the detection quality of 1,2-propylene glycol and provide a new idea for accurate detection.

关 键 词：气相色谱仪 不确定度 1 2-丙二醇 

分 类 号：TS27[轻工技术与工程—农产品加工及贮藏工程] O657.71[轻工技术与工程—食品科学与工程]