| 英文摘要 |
The purpose of this project was to examine the water quality of the pre-chosen 362 drinking water systems and 38 simple tap-water systems of the 22 municipal counties or cities. The test counts of the regulated and non-regulated analytes for drinking water systems were 47 and 23 respectively, which accounted for a total of 70 analytes.
The regulated analytes being tested included 13 items of heavy metals (arsenic, lead, selenium, chromium, cadmium, barium, antimony, nickel, mercury, silver, Indium, molybdenum and aluminium), 1 item of unhealthy substance (cyanide), 4 items of disinfection by-products (total trihalomethanes (TTHMs), bromate, chlorite and haloacetic acids (HAA5)), 15 items of volatile organics (trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, 1,1-dichloroethene, dichloromethane, 1,2-dichlorobenzene, xylenes, cis- and trans- 1,2-dichloroethene, tetrachloroethene and toluene), 13 items of pesticides (endosulfan, lindane, butachlor, 2,4-D, paraquat, methomyl, carbofuran, Isoprocarb, methamidophos, diazinon, parathion, EPN, and monocrotophos) and 1 items of persistent volatile organics (dioxins), which accounted for a total of 38 analytes.
The non-regulated analytes being tested included 3 items of heavy metals (hexavalent chromium, gallium, thallium), 3 item of disinfection by-products (Dichloroacetonitrile, Dibromoacetonitrile and Chloral Hydrate), 6 items of volatile organics (1,1-dichloroethane, 1,2-dichloro propane, styrene, chlorobenzene, ethylbenzene and formaldehyde), 8 items of endocrine disrupting chemicals (nonyl phenols, bisphenol A, dimethyl phthalate (DMP), Diethyl Phthalate (DEP), Di-n-butyl phthalate (DBP), Benzyl butyl phthalate (BBP), Di-n-octyl Phthalat (DNOP), bis(2-ethylhexyl) phthalate (DEHP)), 2 items of microorganism (fecal coliforms, E. coli) and 1 item of persistent volatile organics (dioxin-like Polychlorinated Biphenyls (PCBs)), which accounted for a total of 23 analytes.
The total test counts of the regulated analytes and non-regulated analytes for tap-water systems were 6163 and 675,and the total test counts of the regulated and non-regulated analytes for simple tap-water systems were 473 and 29, respectively. The analytical results indicated that carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, 1,2-dichlorobenzene, xylenes, cis- and trans- 1,2-dichloroethene, endosulfan, lindane, butachlor, 2,4-D, methomyl, carbofuran, Isoprocarb, methamidophos, diazinon, parathion, EPN, monocrotophos and chlorite in tap-water systems, and bromate, cadmium, silver and mercury in simple tap-water systems were not detected or less than the quantitation detection limits.
About the passing rate of the tested locations, the examines all met the drinking water criteria except the sample of TTW-T30 in Taitung county (Green Island water treatment plant), and the passing rate was 97.8%. About the passing rate of all analytes,the examines all met the drinking water criteria except TTHMs, and the passing rate was 99.8%. Besides, all non-regulated analytes were less than the method detection limits or quantitation detection limits except Gallium, Dichloroacetonitrile, Dibromoacetonitrile, Chloral Hydrate and DEHP.
The tested locations with analysis concentration exceeded or approached the drinking water regulatory limits in the first time examines, aluminum concentration exceeded 0.2 mg/L and those with the highest analytes tested results were followed up and re-tested in September and October. The results indicated that the analytes re-tested met the drinking water criteria except TTHMs of TTW-T30 in Taitung county (Green Island water treatment plant) and aluminum of TTW-M02 in Tainan city (Wusanto water treatment plant) still exceeded the alarm value (70% of the drinking water criteria).
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