AUTHOR=Yamakawa Akane , Nagano Kimiyo , Ukachi Miyuki , Onishi Kaoru , Yamashita Katsuyuki , Shibata Tomoki , Takamiya Kazunari , Kani Tomomi , Bérail Sylvain , Donard Olivier F. X. , Amouroux David 

TITLE=Sr Isotopic Composition of NIES Certified Reference Material No. 28 Urban Aerosols

JOURNAL=Frontiers in Environmental Chemistry

VOLUME=2

YEAR=2021

URL=https://www.frontiersin.org/journals/environmental-chemistry/articles/10.3389/fenvc.2021.771759

DOI=10.3389/fenvc.2021.771759

ISSN=2673-4486

ABSTRACT=<p>An interlaboratory study of the National Institute for Environmental Studies (NIES) certified reference material (CRM) No. 28 Urban Aerosols collected from the filters of a central ventilating system in a building in the Beijing city center from 1996 to 2005 was performed to obtain an information value of the Sr isotopic composition. The Sr isotopic composition was measured using multi-collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) to confirm the CRM’s within- and between-bottle homogeneity, and the results showed a <sup>87</sup>Sr/<sup>86</sup>Sr ratio of 0.710227 ± 0.000019 (2SD, <italic>n</italic> = 18). The Sr isotopic compositions were intercompared using thermal ionization mass spectrometry (TIMS), which showed good agreement with values obtained at NIES. Subsequently, a consistent <sup>87</sup>Sr/<sup>86</sup>Sr ratio was observed between two dissolution (hotplate <italic>vs</italic>. high-pressure bomb) and Sr separation (Sr spec resin <italic>vs</italic>. cation exchange resin) methods. To validate and reproduce the accuracy of our analytical methods, the Sr isotopic compositions of secondary reference materials, JB-1b and JA-2, were also measured. Our results showed that NIES CRM No. 28 is appropriate for the quality control of Sr isotope measurements of particulate matter analyses for environmental and geochemical studies.</p>