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Updated: Jun 6, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
Published on: December 20, 2016
Using nitrogen isotopic approach to identify nitrate sources in waters of Tianjin, China
Fujun Yue1, Xiaolong Liu, Jun Li
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China. yuefujun@mails.gyig.ac.cn
Abstract:
To understand the nitrogen sources and fate in the surface water of Tianjin, the concentrations of nitrogen and δ¹⁵N-NO₃⁻ were analyzed in different types of waters. Mostly, NO₃⁻ was the dominant species of DIN (Dissolved Inorganic Nitrogen), although NH₄+ was the main species in certain samples, such as sewage. The δ¹⁵N-NO₃⁻ values ranged from -5.5 to +28.6‰. The water chemical and isotopic results suggested that domestic sewage and agricultural activities were the two main sources of nitrate in surface waters. In addition, the nitrogen isotopic compositions were significantly influenced by nitrification, ammonia volatilization and denitrification.
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