氮氧同位素在城市地表水硝酸盐来源解析的应用进展

Progress on the Application of Nitrogen and Oxygen Isotopes in the Study of Nitrate Sources in Urban Rivers

摘要: 地表水硝酸盐污染造成了地表水体富营养化和水质恶化等的生态环境问题，确定地表水中硝酸盐的来源并加以控制显得尤为重要。利用不同成因的地表河流硝酸盐的δ¹⁵N和δ¹⁸O存在着较大差异，将氮、氧稳定同位素示踪技术用于河流硝酸盐来源解析的研究日益受到研究者的广泛关注。本文综述了利用氮、氧同位素来研究地表水硝酸盐不同来源的研究进展，总结归纳了不同硝酸盐氮来源的δ¹⁵N和δ¹⁸O分布范围，并展望了未来我国地表水硝酸盐来源示踪的可能发展方向。

Abstract: Nitrate pollution has caused serious eco-environmental problems in surface waters. For controlling nitrate pollution, it is necessary to differentiate various nitrate sources using suitable methods. Since δ¹⁵N and δ¹⁸O values vary greatly in different sources of nitrate, more and more researchers pay great attention on the application of nitrogen and oxygen isotopes in surface water nitrate tracing studies. This review summarizes recent trends in the study of distin- guishing different sources of nitrate in surface waters by means of isotope analysis of nitrate and oxygen. And it also gives a prospect on the study of nitrate tracing in Chinese surface waters.