Formation, Health Risk and Control of DBPs in Drinking Water

本研究蒐集台灣北部、中部、南部及金門地區飲 用水中三鹵甲烷之濃度資料，並於2001-2003 年間進 行飲用水中三鹵甲烷採樣分析，以比較各地區三鹵甲 烷濃度之分佈及季節變化；並以蒙地卡羅模擬進行各 地區飲用水中三鹵甲烷之健康風險評估。研究結果顯 示，台灣各地區飲用水中三鹵甲烷組成均有含溴三鹵 甲烷物種出現，且三鹵甲烷之組成及濃度分佈均不 同。在三鹵甲烷物種中，以氯仿有最高之健康風險貢 獻量；不同暴露途徑則以淋浴時之呼吸暴露造成之健 康風險較高。北部及中部因飲用水中三鹵甲烷濃度較 低，因此民眾所承受之總健康風險較低（2×10 -5 ）；南 部地區及金門地區因較高的總三鹵甲烷濃度導致較高的健康風險（5×10 -5 ）。In this study, the distribution of TTHMs concentration in drinking water was collected. Between 2001 and 2003, water samples in northern, central, southern Taiwan and King-man were also collected and analyzed for the THMs concentrations. Monte Carlo simulation was used to estimate the cancer risk for the exposure of THMs in the four areas in Taiwan. Brominated THMs were found in most of the drinking water samples, and THMs concentrations were site specific at different areas. Therefore, people in different areas have different cancer risks. Among the four THMs, chloroform has the highest overall cancer risk. Because of the relatively lower THMs concentrations in northern and central Taiwan, health risk was lower in these area (2×10 -5 ). The higher chloroform concentration in southern Taiwan and the higher TTHMs concentration in King-men result in the relatively higher cancer risk (5×10 -5 )