| 贺国平,刘培斌,慕星,吴琼,刘明柱.永定河冲洪积扇地下水中硝酸盐来源的同位素识别[J].水利学报,2016,47(4):582-588 |
| 永定河冲洪积扇地下水中硝酸盐来源的同位素识别 |
| Identification of nitrate sources in groundwater in the Yongding River alluvial fan with isotope technology |
| 投稿时间：2015-05-11 |
| DOI：10.13243/j.cnki.slxb.20150533 |
| 中文关键词: 地下水 硝酸盐 同位素技术 污染源 |
| 英文关键词: groundwater nitrate isotope technique contaminant source |
| 基金项目:北京市科技计划项目(D07050601510000) |
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| 摘要点击次数: 1841 |
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| 中文摘要: |
| 硝酸盐(NO3-)是北京地下水的主要污染物之一。本文分析了永定河冲积扇不同部位第四系地下水的水化学和氮、氧同位素特征,识别了地下水中NO3-的主要污染源,并定量评价了各种源的贡献。研究区地下水的NO3--N浓度介于1.32~37.44mg/L,80%的地下水样NO3--N浓度超过我国《生活饮用水卫生标准》(20mg/L)。地下水的δ15N-NO3-值介于+9.38‰~+16.96‰,均值12.87‰,δ18O-NO3-值介于+3.13‰~+21.18‰,均值+10.39‰,结合反硝化作用的识别,推断地下水中NO3-主要来自粪肥,部分来自NO3-化肥和大气降水。采用氮、氧同位素和物质平衡混合模型定量评价表明,粪肥对地下水NO3-的贡献为58%~81%,据此提出了保护和改善地下水水质的建议。 |
| 英文摘要: |
| Nitrate(NO3-) is one of the main contaminants in groundwater in Beijing. In this study,the char-acteristics of hydrochemistry,nitrogen isotope(15N-NO3-) and oxygen isotope(18O-NO3-) in different parts of the quaternary groundwater are analyzed in the Yongding River alluvial fan. The contaminant sources of NO3-in the groundwater are identified, and the contributions of these different contaminant sources to the NO3-are evaluated quantitatively. The concentrations of NO3--N in the groundwater range from 1.32 mg/L to 37.44 mg/L,The concentrations of NO3--N in 80% of the groundwater samples exceeded the drinking water standarnd of 20 mg/L. The values of 15N-NO3-in groundwater range from +9.38‰ to +16.96‰ and the mean value is +12.87‰. The values of 18O-NO3-in groundwater range from +3.13‰ to +21.18‰ and the mean value is + 10.39‰. Combined with the identification of denitrification in groundwater, NO3-mainly come from manure and partly come from chemical fertilizer and precipitation. Quantitative evaluation with isotope techniques and material balance model shows that manure contributes 58%~81% to the concentra-tion of NO3-in groundwater. On the basis of this study, the suggestion about how to protect and improve groundwater quality is recommended. |
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