大米粉中马拉硫磷测定结果不确定度评定

Uncertainty Evaluation on Malathion Measurement in Rice Flour

[目的]对大米粉中马拉硫磷的测定结果不确定度进行评定。[方法]根据JJF1059-2012《测量不确定度评定与表示》技术规范要求,建立数学模型,分析了大米粉中马拉硫磷测定结果不确定度评定的主要来源,对各个不确定度分量进行评估和计算合成。[结果]试验表明,影响测量结果的主要因素为回收率(偏差)、标准物质C、气相色谱(GC)响应值I、I0引入的不确定度;而试样质量、定容体积引入的相对标准不确定度相对较小。测得合成不确定度为0.016 mg/kg,扩展不确定度为0.032 mg/kg(95%,k=2)。[结论]研究可为今后提高检验数据的可靠性和一致性提供参考。

[ Objective] To conduct uncertainty evaluation on malathion measurement in rice flour. [ Method ] Based on the guidelines and principles of Evaluation and Expression of Uncertainly in Measurement （JJF1059 -2012 ）, the main sources of uncertainty of malathion measurement in rice flour were assessed and a mathematical model was established. Accordingly, each parameter of the uncertainty was evaluated, measured and combined. [ Result ] The results showed that recovery （deviation）, reference substance C and gas chromatography （GC） response value I and 10 greatly affected the uncertainty of malathion measurement in rice flour, but sample weighting, voluming slightly. The additive and expanded uncertainty of malathion measurement were calculated 0. 016 mg/kg and 0. 032 mg/kg （95%, k = 2 ）, respectively. [ Conclusion] The study provides a reference to improve the reliability and consistency of malathion measurement in rice flour.