We have located links that may give you full text access.
Identifying nitrate sources and transformations in Taizi River Basin, Northeast China.
Environmental Science and Pollution Research International 2017 September
The nitrate (NO3 - ) pollution of aquatic systems in Northeast China is a severe problem. To identify NO3 - sources and transformations in different zones with different land uses in the Taizi River Basin, ion-exchange methods were utilized to determine the concentrations and isotopic compositions (δ15 N and δ18 O) of NO3 - and chloride (Cl- ). Results showed that Cl- concentrations ranged from 2.7 to 73.4 mg/L. Cl- concentrations were the highest in zone 8 and the lowest in zone 1. NO3 - concentrations ranged from 0.3 to 27.4 mg/L and were the highest in zone 1 and the lowest in zone 8. During the sampling period, δ15 N-NO3 - values varied from 3.8 to 37.2‰, and δ18 O-NO3 - values ranged from -0.5 to 10.4‰. δ15 N-NO3 - values were the highest in zone 9 and the lowest in zone 1. The differences in physicochemical parameters and NO3 - isotopes may be affected by land use and biogeochemical nitrogen processes in different zones. The combined analysis of dual isotopes (δ15 N-NO3 - and δ18 O-NO3 - ) and NO3 - /Cl- versus Cl- showed that different sources contributed NO3 - to different zones during the sampling period. Soil N, manure, and sewage were the main NO3 - sources in the Taizi River Basin. In zones 1 to 6, the δ15 N-NO3 - values of almost all samples were more than 10‰, NO3 - /Cl- values were high, and Cl- molar concentration was low during the sampling period. These findings suggested that the volatilization and nitrification of soil NH4 + might be related to NO3 - sources in zones 1 to 6. A 1:1 to 2:1 linear relationship between δ15 N-NO3 - and δ18 O-NO3 - combined with the significantly negative relationship between ln (NO3 - ) and δ18 O-NO3 - indicated that denitrification affected NO3 - distribution in zones 8 to 9 during the sampling period. These results can provide useful information to control NO3 - concentrations in different zones in Taizi River Basin.
Full text links
Related Resources
Trending Papers
Challenges in Septic Shock: From New Hemodynamics to Blood Purification Therapies.Journal of Personalized Medicine 2024 Februrary 4
Molecular Targets of Novel Therapeutics for Diabetic Kidney Disease: A New Era of Nephroprotection.International Journal of Molecular Sciences 2024 April 4
The 'Ten Commandments' for the 2023 European Society of Cardiology guidelines for the management of endocarditis.European Heart Journal 2024 April 18
A Guide to the Use of Vasopressors and Inotropes for Patients in Shock.Journal of Intensive Care Medicine 2024 April 14
Diagnosis and Management of Cardiac Sarcoidosis: A Scientific Statement From the American Heart Association.Circulation 2024 April 19
Essential thrombocythaemia: A contemporary approach with new drugs on the horizon.British Journal of Haematology 2024 April 9
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app