title: Analysis of polychlorinated dibenzo-p-dioxins and furans in various aqueous samples in Taiwan.
abstract: Twenty-one fresh water samples were taken from reservoirs, wells and drinking water treatment plants in Taiwan for measurement of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) concentrations. Due to low concentration of PCDD/Fs, water samples (400-1,000 L) were collected by using the on-site large volume pre-concentration system and analyzed by high resolution gas chromatography (HRGC)/high resolution mass spectrometer (HRMS). Different characteristics of dioxin profiles in surface water and groundwater are observed. The PCDD/F concentrations in fresh water samples varied from 0.001 to 0.265 pg WHO(98)-TEQ/L which are lower than the standard (12 pg WHO(98)-TEQ/L) set by the Taiwan Environmental Protection Administration (TEPA) for drinking water. Only a small fraction (<5%) of the total PCDD/F concentration in fresh water samples was water-soluble. As a result of their hydrophobicity, PCDD/Fs are effectively removed along with suspended solid via the water treatment process (average 98% removal efficiency).
authors: Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan, ROC.
authors: Ngo Thi
authors: NT
authors: Thuan
authors: Ching Lan
authors: CL
authors: Tsai
authors: Ying Minh
authors: YM
authors: Weng
authors: Tzu Yi
authors: TY
authors: Lee
authors: Moo Been
authors: MB
authors: Chang
mesh_terms: D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins / Q000032:analysis; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D013624:Taiwan; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D014881:Water Supply / Q000032:analysis
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004147:Dioxins; D000072317:Polychlorinated Dibenzodioxins; D014874:Water Pollutants, Chemical