一种燃料热沉标准物质候选物的纯度定值及不确定度分析

The Purity Value and Uncertainty Analysis of a Fuel Heat Sink Reference Material Candidate

一种多环烃化合物作为超声速飞行器用燃料热沉标准物质候选物,对于燃料的热沉准确计量具有十分重要的意义。通过采用质量平衡和核磁定量两种不同测量原理的方法,对这种热沉标准物质候选物的纯度进行了定值,并进行了不确定度分析和评定。在此过程中,采用气相色谱法(GC-FID)对候选物的分装样品进行了均匀性检验和稳定性考察。研究结果表明,标准物质候选物纯度均匀性良好,且在1年常规储存条件下(20℃,101.325 kPa)具有良好的稳定性。标准物质候选物定值结果的标准值为99.42%,扩展不确定度为0.84%(k=2)。

A kind of polycyclic hydrocarbon compound can be used as a candidate of fuel heat sink reference material for hypersonic aircrafts,which is of great significance on heat sink measurement. Two different methods,mass balance and quantitative nuclear magnetic resonance approaches were adopted to characterize the purity of the candidate. Moreover,main uncertainty contributions were analyzed,and then the uncertainty of the purity of the candidate was evaluated. In the process of purity valuation,GC-FID was used to test the homogeneity and stability of the subpackage samples. The results showed that the candidate has a good homogeneity,and can store for at least one year under normal storage conditions( 20 ℃,101. 325 k Pa). The purity of the candidate is 99. 42% with the expanded uncertainty of 0. 84%( k = 2).