欧洲标准局IRMM JRC 参考物质证书 IRMM-007_2 64Zn in 0.5 M HNO3 certificate.pdf

JOINT RESEARCH CENTRE Directorate F – Health, Consumers and Reference Materials CERTIFICATE OF ANALYSIS IRMM-007/2 64Zn in 0.5 M HNO3 Certified value 1) Certified uncertainty 2) Unit 64 . -9 . -9 Molality Zn 142.842 10 0.047 10 mol/g n(68Zn)/n(67Zn) 1.033 83 0.000 45 mol/mol n(66Zn)/n(64Zn) 0.005 275 8 0.000 005 7 mol/mol n(67Zn)/n(64Zn) 0.043 039 0.000 020 mol/mol n(68Zn)/n(64Zn) 0.044 495 0.000 018 mol/mol n(70Zn)/n(64Zn) 0.000 083 00 0.000 000 31 mol/mol 1) The certified value for the molality was obtained by gravimetric weighing of the certified reference materials IRMM-652, IRMM-653 and IRMM-654. The isotope amount ratios were obtained by isotopic ratio measurements using a multiple collector ICP-MS. The values are traceable to the International System of Units (SI). 2) The uncertainty is the expanded uncertainty of the certified value with a coverage factor k = 2 corresponding to a level of confidence of about 95 % estimated in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM:1995). This certificate is valid for three years after purchase. Sales date: The material