New Way in NO3--N Contamination Study of Water Environment: Correlative Method of 15N & 18O
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摘要: 最近40年, 硝酸盐已成为一个共同的地下水污染物.使用CaO定量地除去CO2和H2O的新的焊封管燃烧法分析了NO3-中的氮同位素比值.应用AgNO3+C的新的焊封管燃烧法进行了NO3-中氧同位素分析.安阳和林县饮用水中广泛的NO3-N污染大大超过饮用标准是一个主要问题.食管癌的死亡率与饮用水中NO3-、NO2-、NH4+和亚硝胺过剩的含量成正比.δ(15N) 和δ(18O) 研究资料指出, 在这个地区饮用水中的NO3-主要来自农家肥和化肥.地下水NO3-的δ(18O) 明确地指出, 在这个地区不存在有意义的反硝化作用发生.相反, 由NH4+到NO3-的需氧硝化作用可导致NO3-中的氧1/3来自空气, 2/3来自水.
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关键词:
- NO3-中的15N和18O /
- NO3-N污染 /
- 食管癌
Abstract: During the last 40 years, nitrate has become one of the most common groundwater contaminants. In this paper, the nitrogen isotope rations in NO3- have been analyzed by a new sealed-tube combustion technique using CaO for quantitative removal of CO2 and water. Oxygen isotope analysis in NO3- was conducted by using new sealed-tube combustion technique of AgNO3+C. Extensive NO3--N contamination of drinking water in Lin and Anyang district to a level above drinking water limits is a major problem. It is found that the rate of death of esophagus cancer is proportional to the excessive content of NO3-, NO2-, NH4+ and nitrosamine in drinking water. The study data of δ(15N) and δ(18O) show that NO3- in drinking water was predominantly derived from manure and fertilizer in this region. The δ(18O) of groundwater NO3- indicated conclusively that no significant denitrification was found in this area. Conversely, the aerobic nitrification pathway from NH4+ to NO3- results in one third of the oxygen in the NO3- derived from air and two thirds derived from water.-
Key words:
- δ(15N) and δ(18O) in NO3- /
- NO3--N contamination /
- esophagus cancer
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