离子色谱法测定黔产天麻中二氧化硫残留的不确定度评定

Evaluation of Uncertainty in Detection of Sulfur Dioxide in Guizhou Gastrodia elata by Ion Chromatography

目的:评定离子色谱法测定天麻中二氧化硫残留的测量不确定度。方法:依据《食品安全国家标准食品中二氧化硫的测定》(GB/T 5009.34—2022)采用离子色谱法测定天麻中二氧化硫残留,分析测定过程中各不确定度分量,并计算合成相对标准不确定度和扩展不确定度。结果:离子色谱法测定黔产天麻中二氧化硫残留的结果表示为(6.86±1.04)mg·kg^(-1)。结论:天麻中二氧化硫残留测量不确定度主要来源于标准溶液配制引入的不确定度、标准曲线拟合引入的不确定度、重复测定引入的不确定度,实验人员应使用校准过的玻璃量器,严格控制待检验样品与标准溶液在同一条件下进行测定,并对前处理过程采取质量控制措施,以保证检测结果的准确性和可靠性。

Objective:To evaluate the measurement uncertainty in the determination of residual sulfur dioxide in Gastrodia elata using ion chromatography.Method:According to GB/T 5009.34—2022,ion chromatography was used to determine sulfur dioxide residue in Gastrodia elata.The uncertainty components in the determination process were analyzed,and the synthetic relative standard uncertainty and expanded uncertainty were calculated.Result:The residual sulfur dioxide content in Gastrodia elata from Guizhou is determined by ion chromatography,reported as(6.86±1.04)mg·kg^(-1).Conclusion:The measurement uncertainty of sulfur dioxide residue in Gastrodia elata mainly comes from the uncertainty introduced by the preparation of standard solution,the uncertainty introduced by standard curve fitting,and the uncertainty introduced by repeated determination.The experimenter should use calibrated glass gauge,strictly control the sample to be tested and the standard solution under the same conditions for determination,and take quality control measures for pre-treatment process,ensure accuracy and reliability of the test results.