頁籤選單縮合
題名 | 沖積扇補注區地下水之硝酸鹽汙染=Nitrate Pollution in the Groundwater Recharge Areas of Alluvial Fans, Taiwan |
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作者 | 陳文福; 呂學諭; Chen, Wen-fu; Lu, Hsueh-yu; |
期刊 | 經濟部中央地質調查所彙刊 |
出版日期 | 20091200 |
卷期 | 22 2009.12[民98.12] |
頁次 | 頁99-123 |
分類號 | 351.85 |
語文 | chi |
關鍵詞 | 扇頂補注區; 濁水溪; 屏東平原; 地下水; 硝酸鹽; Fan head recharge area; Choshui; Pingtung; Groundwater; Nitrate; |
英文摘要 | Alluvial fans are the most important aquifers for its abundant reserve as a groundwater resource in Taiwan. Groundwater extractions in alluvial fans of Choshui and Pingtung amount to over 60 % of the total yield in Taiwan. Nitrate levels in Choshui alluvial fan aquifers were higher from 1991 on because of agricultural manure (N fertilizer) and untreated sewage leakage. High concentrations of nitrate (nitrate – N > 10 mg/l) in drinking water is known to cause methemoglobinemia (blue baby syndrome) in infants while low concentrations of nitrate (nitrate - N 1-10 mg/l) is a probable carcinogen. During our monitoring period of 1997-2007, about 10 % of the wells in Choshui alluvial fan had elevated nitrate levels and 32 % were detected in Pingtung alluvial fans because of a broader fan head recharge area. There are 7 wells in Choshui with nitrate-N concentrations that once exceed the safe standard for drinking water of 10 mg/l and 4 wells exceeding that same standard in Pingtung. Nitrate concentrations in groundwater show seasonal variation that are lower concentrations because of the diluting of rainfall and stream water in the rainy season and are higher in dry season because evaporating soil water. Denitrification is another important process to control nitrate concentrations under 0.06 mg/l (the detection limit of our method) in groundwaters of the middle-lower fan. Nitrate is one of the world’s most common pollutants in groundwater systems. During the last 50 years, human activities have dramatically increased inputs of nitrogen into groundwater. We suggest that a new comprehensive monitoring program should be implemented to monitor these localized areas on site where nitrate has been detected in groundwater above regulatory guidelines with regard to public-supply wells, domestic wells of local communities and monitoring wells. |
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