An improved ion-exchange/diffusion method for N-15 isotope tracing analysis of nitrate in surface waters from watersheds
- 海洋环境－已发表论文 
An improved method, suitable for collecting nitrate from surface waters in the watershed for N-15 isotope tracing analysis, was developed on the basis of the anion exchange coupled with diffusion through systematic simulation and comparison experiments. The results showed that the nitrate could be separated and enriched from the waters efficiently by using the improved method. Being simple and practical in operation principle and procedures, cost-economic, and highly efficient in nitrate separation/enrichment, the method met the requirements of alpha N-15 mass spectrum analysis and would lay a foundation for the application of N-15 isotope tracing approach to the research on non-point source pollution in watershed.