摘要
目的 评定气相色谱法测定橄榄油总迁移量的不确定度,确定影响结果准确性的因素,为橄榄油总迁量检测的准确度控制提供依据.方法 采用气相色谱法测定橄榄油总迁移量,建立数学模型.根据不确定度评定相关规则和标准对实验过程中的不确定度因素包括重复性、试样质量、仪器校准、标准曲线拟合、浸泡面积等进行不确定度评定.结果 试样的橄榄油总迁移量为4.0 mg/dm2,其扩展不确定度为1.4 mg/dm2(P=95％,k=2).结论 橄榄油总迁移量的不确定度主要来源有重复性测定和试样提取的橄榄油质量.
Abstract
Objective To evaluate the uncertainty in determination of olive oil total migration by gas chromatography spectrometry,determine the factors affecting the accuracy of the results and provide a basis for accurate control of the olive oil total migration.Methods Gas chromatography spectrometry was used to determine the olive oil total migration,and a mathematical model was established.According to relevant rules and standards for uncertainty evaluation,the uncertainty was evaluated including repeatability,sample quality and adsorbed olive oil quality,instrument calibration,standard curve fitting,soaking area,etc.Results When The total migration of olive oil in the sample is 4.0 mg/dm2,the expanded uncertainty was 1.3 mg/dm2(P=95％,k=2).Conclusion The uncertainty of olive oil total migration mainly comes from repeatability,standard solution preparation and standard curve fitting.
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