| Issue |
E3S Web Conf.
Volume 98, 2019
16th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
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|---|---|---|
| Article Number | 12018 | |
| Number of page(s) | 6 | |
| Section | Applied Isotope Geochemistry | |
| DOI | https://doi.org/10.1051/e3sconf/20199812018 | |
| Published online | 07 June 2019 | |
Application of Multi-Tracer Methods to Evaluate Nitrate Sources and Transformation in Sabkha Matti (Saudi Arabia)
1
Department of Earth and Environmental Science, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
2
Isotope Tracer Technologies Inc, Waterloo, Ontario, N2V 1Z5, Canada
3
School of Engineering, University of Guelph, Guelph, ON, N1G 2W2, Canada
4
Department of Earth and Environmental Sciences, Michigan State University, 288 Farm Lane, MI 48824, United States
* Corresponding author : wsaeed@uwaterloo.ca
An unusually high concentration of nitrate (NO3) ranging between 291 and 6790 mg/L (as N) was observed during a review of solute data for brine samples from the inland Sabkha Matti. A multi-tracer approach considering water chemistry, stable nitrate isotopes (δ15N and δ18O), and the radioactive isotope of hydrogen (tritium, 3H) was utilized to evaluate the nitrate sources and transformation in this hydrogeological setting. The results suggested that the source of the high nitrate levels is related to a leakage from a manure/septic system near the proximal eastern edge of the Sabkha. Moreover, the impact of Sabkha’s characteristics on biological denitrifications was evaluated in this study. The results suggest that denitrification was not a major process in Sabkha Matti. Several factors may contribute to the limitation of denitrification on the brine samples including high dissolved oxygen contents, high salinity and chloride.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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