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H2 O的新的焊封管燃烧法分析了NO-3 中的氮同位素比值 .应用AgNO3+C的新的焊封管燃烧法进行了NO-3 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NO-3 、NO-2 、NH+4 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NO-3 主要来自农家肥和化肥 .地下水NO-3 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NH+4 到NO-3 的需氧硝化作用可导致NO-3 中的氧 1/ 3来自空气 ,2 / 3来自水 .
s: During the last 40 years, nitrate has become one of the most common groundwater contaminants. In this paper, the nitrogen isotope rations in NO- 3 have been analyzed by a new sealed-tube combustion technique using CaO for quantitative removal of CO 2 and water. Oxygen isotope analysis in NO- 3 was conducted by using new sealed-tube combustion technique of AgNO 3+C. Extensive NO- 3-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 NO- 3, NO- 2, NH+ 4 and nitrosamine in drinking water. The study data of δ( 15N) and δ( 18O) show that NO- 3 in drinking water was predominantly derived from manure and fertilizer in this region. The δ( 18O) of groundwater NO- 3 indicated conclusively that no significant denitrification was found in this area. Conversely, the aerobic nitrification pathway from NH+ 4 to NO- 3 results in one third of the oxygen in the NO- 3 derived from air and two thirds derived from water.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2003年第2期219-224,共6页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目 (No .40 0 72 0 81) .
