title: Sediment certified reference materials for the determination of polychlorinated biphenyls and organochlorine pesticides from the National Metrology Institute of Japan (NMIJ).
abstract: Two marine sediment certified reference materials, NMIJ CRM 7304-a and 7305-a, have been issued by the National Metrology Institute of Japan in the National Institute of Advanced Industrial Science and Technology (NMIJ/AIST) for the determination of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs). The raw materials of the CRMs were collected from a bay near industrial activity in Japan. Characterization of these CRMs was conducted by NMIJ, where the sediments were analyzed using multiple analytical methods such as pressurized liquid extraction (PLE), microwave-assisted extraction (MAE), saponification, Soxhlet extraction, supercritical fluid extraction (SFE), and ultrasonic extraction; the target compounds were determined by one of the primary methods of measurements, isotope dilution-mass spectrometry (ID-MS). Certified values have been provided for 14 PCB congeners (PCB numbers 3, 15, 28, 31, 70, 101, 105, 138, 153, 170, 180, 194, 206, 209) and 4 OCPs (gamma-HCH, 4,4'-DDT, 4,4'-DDE, 4,4'-DDD) in both CRMs. NMIJ CRM 7304-a has concentrations of the contaminants that are a factor of 2-15 greater than in CRM 7305-a. Both CRMs have information values for PCB homolog concentrations determined by collaborative analysis using a Japanese official method for determination of PCBs. The total PCB concentrations in the CRMs are approximately 920 and 86 microg kg(-1) dry mass respectively.
authors.affiliation: Organic Standards Section 2, National Metrology Institute of Japan (NMIJ), AIST, 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8563, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Numata
authors.forename: Takashi
authors.initials: T
authors.lastname: Yarita
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Aoyagi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Tsuda
authors.forename: Misako
authors.initials: M
authors.lastname: Yamazaki
authors.forename: Akiko
authors.initials: A
authors.lastname: Takatsu
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Chiba
authors.forename: Kensaku
authors.initials: K
authors.lastname: Okamaoto
mesh_terms: D002568:Certification; D019015:Geologic Sediments / Q000737:chemistry*; D006077:Government Agencies / Q000592:standards*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis / Q000737:chemistry*; D007564:Japan; D010575:Pesticides / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012015:Reference Standards; D014131:Trace Elements / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D014131:Trace Elements; D011078:Polychlorinated Biphenyls