Gramlich J W, Beary E S, Machlan L A, Barnes I L
National Institute of Standards and Technology, Gaithersburg, MD 20899.
J Res Natl Inst Stand Technol. 1989 Nov-Dec;94(6):357-362. doi: 10.6028/jres.094.035.
Twenty-nine samples of high-purity nickel metals, reagent salts and minerals, collected from worldwide sources, have been examined by high-precision isotope ratio mass spectrometry for their nickel isotopic composition. These materials were compared directly with SRM 986, certified isotopie standard for nickel, using identical measurement techniques and the same instrumentation. This survey shows no statistically significant variations among the samples investigated, indicating that the certified atomic weight and associated uncertainty for SRM 986 is applicable to terrestrial nickel samples. The atomic weight calculated for SRM 986 is 58.69335±0.00015 [2]. The currently recommended IUPAC value for terrestrial nickel is 58.69±0.01.
从世界各地收集了29个高纯度镍金属、试剂盐和矿物样本，采用高精度同位素比率质谱法对其镍同位素组成进行了检测。使用相同的测量技术和仪器，将这些材料直接与SRM 986（镍的认证同位素标准物质）进行比较。本次调查显示，所研究的样本之间不存在统计学上的显著差异，这表明SRM 986的认证原子量及相关不确定度适用于地球镍样本。计算得出SRM 986的原子量为58.69335±0.00015 [2]。目前国际纯粹与应用化学联合会（IUPAC）推荐的地球镍原子量值为58.69±0.01。
