title: Preparation and certification of the new reference materials; plastics (disk form, JSAC 0621-0625) for determination of mercury using x-ray fluorescent analysis.
abstract: The Japan Society for Analytical Chemistry has developed some new plastic certified reference materials (CRMs) for the analysis of mercury in polyester disks using XRF analysis. These CRMs (named as JSAC 0621-0625) were prepared by casting polyesters including a toluene solution of organometallic compounds as a standard. Concentrations of the five levels of mercury ranged from 0 to 250 mg/kg. Homogeneity tests of prepared disks had shown excellent results. Interlaboratory comparison study for the certification was performed by 15 laboratory participants. The z-scores in robust statistical method was applied for the evaluation of outliers. The certified values were assigned after discarding outliers. The uncertainties of certified values were determined as the confidence levels of 95%.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Nakano
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nakamura
authors.forename: Izumi
authors.initials: I
authors.lastname: Nakai
authors.forename: Akira
authors.initials: A
authors.lastname: Kawase
authors.forename: Makoto
authors.initials: M
authors.lastname: Imai
authors.forename: Mikio
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Yohichi
authors.initials: Y
authors.lastname: Ishibashi
authors.forename: Isamu
authors.initials: I
authors.lastname: Inamoto
authors.forename: Kazuhuyu
authors.initials: K
authors.lastname: Sudou
authors.forename: Masaru
authors.initials: M
authors.lastname: Kozaki
authors.forename: Akira
authors.initials: A
authors.lastname: Tsuruta
authors.forename: Akihiro
authors.initials: A
authors.lastname: Ono
authors.forename: Kazutoshi
authors.initials: K
authors.lastname: Kakita
authors.forename: Mamoru
authors.initials: M
authors.lastname: Sakata