title: Water-quality monitoring technique for dioxins during dredging using on-site solid phase extraction with graphitic carbon and analysis with DR-CALUX.
abstract: In Japan, water-quality monitoring with the environmental dioxin standard of 1 pg-TEQ/L at basic monitoring points set in a border between operation-area water and normal water is necessary for removal operations for bottom sediments containing dioxins. This paper presents a technique for combining on-site graphitic carbon (GrC) solid-phase extraction and bioassay method for the simplification and facilitation of water-quality monitoring. Using this method, we conducted experiments at an actual sediment removal site. Comparative analyses using high-resolution GC/MS (HRGC-HRMS) between the dioxin concentrations detected using a GrC solid-phase extraction kit and the official analytical method yielded similar concentrations and distributions of isomers for detected PCDD/Fs and DL-PCBs. The GrC solid-phase extraction method is inferred to have capacity equal to official analytical method extraction. Toxicity equivalent concentrations estimated using DR-CALUX correlate with equivalent concentrations with HRGC/HRMS. No false positive or false negative result was obtained for the standard value 1 pg-TEQ/L.
authors.affiliation: Penta-Ocean Construction Co., Ltd., Tokyo, Japan. Masahiro.Satou@mail.penta-ocean.co.jp
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: H
authors.initials: H
authors.lastname: Takigami
authors.forename: K
authors.initials: K
authors.lastname: Hayakawa
authors.forename: S
authors.initials: S
authors.lastname: Sakai
mesh_terms: D004147:Dioxins / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D004147:Dioxins; D014874:Water Pollutants, Chemical; D006108:Graphite