| 英文摘要 |
The purpose of this project was to examine the water quality of the pre-chosen 362 drinking water systems and 39 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 38 and 30 respectively, which accounted for a total of 68 analytes.
The regulated analytes being tested included 12 items of heavy metals (arsenic, lead, selenium, chromium, cadmium, barium, antimony, nickel, mercury, silver, Indium and molybdenum), 1 item of unhealthy substance (cyanide), 3 items of disinfection by-products (total trihalomethanes (TTHMs), bromate and chlorite), 8 items of volatile organics (trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, and 1,1-dichloroethene), 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 5 items of heavy metals (exavalent chromium, gallium, thallium, aluminium, vanadium), 1 item of disinfection by-products (haloacetic acids (HAA5)), 12 items of volatile organics (dichloromethane, 1,1-dichloroethane, 1,2-dichloropropane, 1,2-dichlorobenzene, xylenes, styrene, cis- and trans- 1,2-dichloroethene, tetrachloroethene, chlorobenzene, toluene, ethylbenzene), 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 (DOP), bis(2-ethylhexyl) phthalate (DEHP)), 1 item of biological metabolites (microcystin-LR), 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 30 analytes.
The total test counts of the regulated analytes and non-regulated analytes for drinking water systems were 5402 and 2402, respectively, while the total test counts of the regulated and non-regulated analytes for simple tap-water systems were 476 and 39 in the year of 2013. The analytical results from 2013 indicated that mercury, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene, 1,4-dichlorobenzene, endosulfan, lindane, butachlor, 2,4-D, paraquat, methomyl, carbofuran, MIPC, methamidophos, diazinon, parathion, EPN, and monocrotophos in drinking water supply systems, and bromate, mercury, trichoroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,2-dichloroethane, vinyl chloride, benzene and 1,4-dichlorobenzene in simple tap-water systems were not detected or less than the quantitation detection limits of the respective analytical methods. Water examined for all tested locations met the required drinking water criteria except samples TTW-V01 in Kin-men county (Tai-hu water treatment plant), which had a passing rate of 95.6%. All analytes tested met the required drinking water criteria except bromate and TTHMs, which had a passing rate of 99.5%. Besides aluminium, gallium, vanadium, toluene, o – xylene, DEHP and HAA5, all other non-regulated analytes were less than the method detection limits or quantitation detection limits.
The test locations with analytes whose concentration exceeded or approached the drinking water regulatory limits in the first stage of 2013, concentration exceeded 0.2 mg/L and those with the highest historical results were followed up and re-tested in October this year. The results indicated that the analytes re-tested met the drinking water quality standards except TTHMs of TTW-V01 in Kin-men county (Tai-hu water treatment plant) still exceeded the drinking water regulatory limits and aluminum of TTW-B13 in New Taipei city, TTW-H14 in Nan-tou county, TTW-K01 and K02 in Chia-yi city and TTW-M01 in Tainan city still exceeded 0.2 mg/L.
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