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Panda, N.,Kim, M.,Aoki, N.,Zhou, Z.,Shimosaka, T.,Kim, Y.,Lee, S.,Kim, D. Springer Science + Business Media 2016 Accreditation and quality assurance Vol.21 No.4
<P>A validation study for primary formaldehyde gas standards was performed at three National Metrology Institutes: the Korea Research Institute of Standards and Science (KRISS), the National Metrology Institute of Japan (NMIJ) and the National Institute of Metrology of China (NIM). The studied materials had a nominal amount fraction of 2 mu mol/mol formaldehyde in nitrogen balance and were prepared in 10-L aluminum cylinders by KRISS. The impurities in the materials were analyzed using a gas chromatograph/atomic emission detector and a Fourier-transform infrared spectrometer (FTIR). The stability of the materials was assessed for 1 year by KRISS using paraformaldehyde as a source for the primary standard gas and a cavity ring-down spectrometer (CRDS) instrument as the measurement method. The amount fraction of formaldehyde in the materials decreased linearly by 0.74 % each month. The studied materials that exhibited similar linear rates of decline were distributed to the participants. After the measurement was completed by the participants, the materials were returned to KRISS and the stability analysis based on the primary standard maintained at KRISS was repeated. NMIJ analyzed the materials using paraformaldehyde as the source of the primary standard of formaldehyde and FTIR analysis, whereas NIM used trioxane as the primary standard gas source and CRDS analysis. The results of the comparison revealed good agreement between the results and were within the expanded uncertainty of 2 % although each of them used different combinations of methods in the generation of primary gas standards and measurements.</P>
Akira Kitayama,Kazunori Kadota,Seika Fujioka,Yuto Konishi,Hiromasa Uchiyama,Yuichi Tozuka,Atsuko Shimosaka,Mikio Yoshida,Yoshiyuki Shirakawa 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
The amorphization of indomethacin (IMC) with cystine (Cys2) was studied by discrete element method (DEM) simulations and principal component analysis (PCA). X-ray powder diffraction (XRPD) analysis suggested that the conversion of crystalline IMC to amorphous state was accelerated by co-grinding with Cys2. XRPD spectra about amorphization of IMC with Cys2 were analyzed by PCA. PCA results suggest that IMC/Cys2 system undergoes two-phase amorphization, as indicated by the 2nd PC score, and that the change in phase depends on the total frictional energy calculated by DEM simulations. Electron spin resonance result revealed that the radical from Cys2 may be related to the amorphized progression of IMC.
International comparison CCQM-K116: 10 μmol mol<sup>-1</sup> water vapour in nitrogen
Brewer, P J,Gieseking, B,Feracci, V F,Ward, M,Wijk, J van,Veen, A M H van der,Lima, A A,Augusto, C R,Oh, S H,Kim, B M,Lee, S,Konopelko, L A,Kustikov, Y,Shimosaka, T,Niederhauser, B,Guillevic, M,Pascal BUREAU INTERNATIONAL DES POIDS ET MESURES 2018 METROLOGIA -BERLIN- Vol.55 No.1