元素分析仪测定丁腈橡胶中结合丙烯腈含量的不确定度评定

Assessment of Uncertainty in Measurement of Bound Acrylonitrile Content by Elemental Analyzer

对元素分析仪测定丁腈橡胶中结合丙烯腈的含量的不确定度进行了评定,讨论了测试过程中由测量重复性、标准样品、称量等因素所带来的不确定度分量,计算了测定中的合成标准不确定度及扩展不确定度。结果表明仪器的测试重复性引入的不确定度分量是不确定度的主要来源。当丁腈橡胶中结合丙烯腈含量为29.58%时,其扩展不确定度为0.18%。

The uncertainty of determining bound acrylonitrile content in acrylonitrile-butadiene rubber was assessed. The uncertainty components of testing repeatability, standard sample and weighing were discussed. The combined standard uncertainty and expanded uncertainty were calculated. The results indicate that the expand uncertainty is 0.18% when the bound acrylonitrile content is 29.58%.