Zhu Yanbei, Narukawa Tomohiro, Inagaki Kazumi, Miyashita Shin-Ichi, Kuroiwa Takayoshi, Ariga Tomoko, Kudo Izumi, Koguchi Masae, Heo Sung Woo, Suh Jung Ki, Lee Kyoung-Seok, Yim Yong-Hyeon, Lim Youngran
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST).
Anal Sci. 2017;33(3):403-407. doi: 10.2116/analsci.33.403.
A certified reference material (CRM), NMIJ CRM 7203-a, was developed for the elemental analysis of tap water. At least two independent analytical methods were applied to characterize the certified value of each element. The elements certified in the present CRM were as follows: Al, As, B, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Pb, Rb, Sb, Se, Sr, and Zn. The certified value for each element was given as the (property value ± expanded uncertainty), with a coverage factor of 2 for the expanded uncertainty. The expanded uncertainties were estimated while considering the contribution of the analytical methods, the method-to-method variance, the sample homogeneity, the long-term stability, and the concentrations of the standard solutions for calibration. The concentration of Hg (0.39 μg kg) was given as the information value, since loss of Hg was observed when the sample was stored at room temperature and exposed to light. The certified values of selected elements were confirmed by a co-analysis carried out independently by the NMIJ (Japan) and the KRISS (Korea).
一种用于自来水元素分析的有证标准物质（CRM），即NMIJ CRM 7203-a被研制出来。至少采用两种独立分析方法来确定每种元素的标准值。本CRM中认证的元素如下：铝、砷、硼、钙、镉、铬、铜、铁、钾、镁、锰、钼、钠、镍、铅、铷、锑、硒、锶和锌。每种元素的标准值表示为（特性值±扩展不确定度），扩展不确定度的包含因子为2。在评估扩展不确定度时考虑了分析方法的贡献、方法间方差、样品均匀性、长期稳定性以及校准用标准溶液的浓度。汞的浓度（0.39 μg/kg）作为参考值给出，因为当样品在室温下储存并暴露于光下时会观察到汞的损失。选定元素的标准值由日本计量院（NMIJ）和韩国标准科学研究院（KRISS）独立进行的协同分析予以确认。
