酱油中氨基酸态氮含量测量不确定度的评定

分析容量分析法测定酱油中氨基酸态氮含量的测量不确定度的影响因素，建立数学模型，对各不确定度分量进行分析和计算，通过合成和扩展得到酱油中氨基酸态氮测定结果的扩展不确定度为0．014g/(100mL)。     

注射重量法制备乙醇气体标准物质的不确定度

分析了注射重量法制备乙醇气体标准物质不确定度的来源,包括乙醇称量过程引入的不确定度、氮气称量过程引入的不确定度、乙醇纯度引入的不确定度、氮气纯度引入的不确定度。合成不确定度及扩展不确定度分别为0.08%、0.16%(k=2)     

Green's function calculation of through‐bond electronic coupling in donor–bridge–acceptor model systems II: Importance factors applied to atomic sites

Importance factors, associated with the Green's function formalism, are introduced. They are applied for the determination of the relative atomic site contribution to the electronic interaction propagation in a molecular system. The calculation is performed at the Hartree–Fock (self‐consistent) level, using ab initio STO‐3G, 4‐31G, and D95 basis sets. The results are compared with those obtained from the charge densities of the appropriate molecular orbitals at the ab initio STO‐3G level. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005     

Uncertainty sources in UV-Vis spectrophotometric measurement

An overview is given of the most important uncertainty sources that affect analytical UV-Vis spectrophotometric measurements. Altogether, eight uncertainty sources are discussed that are expected to have influence in chemical analysis. It is demonstrated that the well-known intrinsic (or “physical”) sources of uncertainty that originate from the instrument itself (repeatability of spectrophotometer reading, spectrophotometer drift, stray light, etc.) often have significantly lower contributions to the combined uncertainty of the result than the “chemical” sources of uncertainty that originate from the object under study (interference from the constituents of the matrix, decomposition of the photometric complex, etc.). Although selectivity of a photometric procedure is often considered more a validation topic than an uncertainty topic, it is very often important to include it also in the uncertainty budget.Usually the most difficult part of uncertainty estimation of a chemical measurement result is to evaluate the magnitude of the actual uncertainty components, especially the chemical ones. For most of the uncertainty sources discussed in this paper, approaches for their evaluation are given. A generic uncertainty budget for absorbance is presented. Electronic Supplementary Material Supplementary material is available for this article at     

果蔬类农产品中农药残留量检测的不确定度评定

对NY/T 761-2004法测定果蔬类农产品中农药残留量的不确定度进行评定。通过建立数学模型,分析了测量过程的不确定度主要来源于提取溶剂量取体积不确定度、分取液体积不确定度、定容体积不确定度、标准溶液不确定度、峰面积不确定度。以甲胺磷的测量为例,对不确定度的各个分量进行计算,当甲胺磷检测浓度为1.091μg/g时,扩展不确定度为0.036μg/g。     

环境监测实验室测量不确定度的评估程序

提出环境监测实验室测量不确定度的评估程序、评估原则、注意事项。     

碘量法测定水中溶解氧含量测量不确定度的评定

分析碘量法测定水中溶解氧含量测量不确定度的影响因素，对测量不确定度各个分量的评定结果表明，测量重复性的不确定度分量最大，其次是样品溶液的体积、滴定溶液的体积和滴定溶液的浓度等不确定度分量，计算得到水中溶解氧含量测定结果的合成不确定度为0．06mg/L，扩展不确定度为0．12mg/L。