title: Preparation and certification of arsenobetaine reference material NMIJ CRM 7901-a.
abstract: An arsenobetaine [(CH(3))(3)As(+)CH(2)COO(-)] solution reference material, NMIJ CRM 7901-a, intended for use in the speciation of arsenic compounds, was developed and certified by the National Metrology Institute of Japan (NMIJ), part of the National Institute of Advanced Industrial Science and Technology (AIST). The high-purity arsenobetaine powder was synthesized from trimethylarsine [(CH(3))(3)As], and it was dissolved in water in order to prepare 20 mg kg(-1) of arsenobetaine standard solution. The solution was bottled in 500 bottles (each containing 10 ml). Certification of the CRM for arsenobetaine was conducted by NMIJ. The concentration of As was determined by four independent analytical techniques (ICP-MS, ICP-OES, GFAAS and LC-ICP-MS), and each result was converted to the arsenobetaine concentration by applying an appropriate factor. The arsenobetaine concentration in the CRM was thus certified.
authors.affiliation: Environmental Standard Section, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and technology, Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Narukawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Chiba
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Kuroiwa
authors.forename: Takashi
authors.initials: T
authors.lastname: Yarita
authors.forename: Akiko
authors.initials: A
authors.lastname: Takatsu
mesh_terms: D001152:Arsenicals / Q000592:standards*; D013058:Mass Spectrometry / Q000379:methods; D012015:Reference Standards; D013054:Spectrophotometry, Atomic / Q000379:methods
chemical_list: D001152:Arsenicals; C038992:arsenobetaine