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Noro J.,The Japan Society for Analytical Chemistry | Noro J.,Nissan Motor Co. | Korenaga T.,The Japan Society for Analytical Chemistry | Korenaga T.,Tokyo Metroplitan University | And 14 more authors.
Bunseki Kagaku | Year: 2010

The Japan Society for Analytical Chemistry has developed a series of certified reference materials (CRMs) for the X-ray fluorescence analysis of Ag, Cu, Pb, and Cd in lead-free solder alloys, named JSAC 0131-0134. In order to prevent oxidations within the process of fusion, the surfaces of samples were covered by a reducing agent. Furthermore, in order to make a fine metallographic structure, the samples at fusion were quickly cooled by water. By using these new methods, homogeneous samples could be prepared. The concentrations of the four elements ranged from 0.488 to 3.91 mass% for Ag, 0.102 to 1.01 mass% for Cu, 13.9 to 2007 mg kg -1 for Pb, and 0(<3) to 1530 mg kg -1 for Cd. The certified values were evaluated by statistical analyses of the results of an interlaboratory comparison study. This study was supported by participants from 20 laboratories for obtaining data. The z scores in the robust method were applied to a statistical analysis. The certified uncertainties were determined at confidence levels of 95%. These products are the first CRMs in Japan for the determination of hazardous elements and major elements in lead-free solder alloys. © 2010 The Japan Society for Analytical Chemistry. Source


Tanaka T.,The Japan Society for Analytical Chemistry | Inoba S.,The Japan Society for Analytical Chemistry | Kawada S.,The Japan Society for Analytical Chemistry | Kida A.,The Japan Society for Analytical Chemistry | And 9 more authors.
Bunseki Kagaku | Year: 2010

The Japan Society for Analytical Chemistry has developed coal ash certified reference materials (CRMs), JSAC 0521 and 0522, whose concentrations of principal constituents (Si, Al, Ca, Mg, Fe, K, Na, P, Sr, Ti, C and S), trace constituents (As, B, Be, Cd, Co, Cr, Cu, F, Hg, Mn, Ni, Pb, Se, V and Zn) and ignition loss were certified. JSAC 0521 and JSAC 0522 were prepared from Japanese coal ash and foreign coal ash, respectively. CRMs were checked according to the method of JSAC CRM QM002, and the homogeneities were shown to be excellent. Certified values were obtained from statistical analyses of the results of interlaboratory comparisons for coal ashes. Twenty one laboratories participated in this study, but the results for Cd and F were obtained from 11 and 6 laboratories, respectively. Precise results for Cd (11 laboratories) were obtained only by inductively coupled plasma-mass spectrometry (ICP-MS), atomic absorption spectrophotometry and inductively coupled plasma-atomic emission spectrometry (ICP-AES) at a wavelength of 228.798 nm, because the line is not interfered in the presence of Fe and/or Pt. The results for F proved that, statistically, there is a difference in their extraction efficiency between distillation and pyrohydrolysis. Higher results were obtained by pyrohydrolysis than those by distillation; a recovery of F was incomplete by one-time distillation. Only the results by pyrohydrolysis (6 laboratories) were employed in this study. © 2010 The Japan Society for Analytical Chemistry. Source

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