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Published: 2020-06-15
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DOI: https://doi.org/10.53747/jnst.v10i2.35
Issue
Vol. 10 No. 2 (2020)
Section
Articles
How to Cite
Nguyen Thi Huong, . L., Nguyen Minh, D., Phan Quang, T., Vo Thi Mong, T., Le Xuan, T., Phan Son, H., & Nguyen Van, P. (2020). Assessment of nitrogen nutrient sources in aquatic environment of Tuyen Lam sub-catchment based on it’s stable isotopes ratio (δ¹⁵N-NO3) combined with geochemical parameters. Nuclear Science and Technology, 10(2), 32-43. https://doi.org/10.53747/jnst.v10i2.35

Assessment of nitrogen nutrient sources in aquatic environment of Tuyen Lam sub-catchment based on it’s stable isotopes ratio (δ¹⁵N-NO3) combined with geochemical parameters

Nguyen Thi Huong Lan1, Nguyen Minh Dao1, Phan Quang Trung1, Vo Thi Mong Tham1, Le Xuan Thang1, Phan Son Hai1, Nguyen Van Phuc1
1 Dalat Nuclear Research Institute

Main Article Content

Abstract

Overloading and erosion of pollutants, especially nitrogen (nitrate and ammonium) nutrient, in catchment of multiple land use put pressure on the quality of surface water. Excess of nitrogen nutrient in the aquatic environment causes eutrophication leading to adverse effects to the habitat and ultimately it could affect the human health through the food chain. The aim of this study is to assess the sources of nitrogen nutrient that could affect the quality of surface water at a subcatchment of Tuyen Lam reservoir in Lam Dong province by the use of water’s physico-chemical parameters combined with stable isotope ratio of nitrogen in nitrate (δ15N-NO3) dissolved in the water. It was revealed that nitrogen nutrient in water from springs in the study area came from at least three sources: decomposition of soil organic matters, inorganic fertilizers and water waste from residential areas. In points of annual crop farming and close to residential the contribution of inorganic fertilizers to the total concentration of nitrate was estimated, based on the δ15N-NO3 values, to be as high as more than 60% and the contribution of water waste was around 35-40%. This is the first time isotopic signature of nitrogen-15 in nitrate (δ15N-NO3) was applied as a tool to assess and identify sources of the nutrient in aquatic environment. Results of this study, although it was initial but it would be useful for the local environmental managers in developing suitable strategies to control over nitrogennutrient releases in order to keep the aesthetic appeal of Tuyen Lam Reservoir.

Article Details

Keywords

Water quality, Nitrate, Stable isotope ratio

References

[1]. Cravotta, C.A.I., “Use of Stable Isotopes of Carbon, Nitrogen, and Sulfur to Identify Sources of Nitrogen in Surface Waters in the Lower Susquehanna River Basin”. USGS, Pennsylvania, p. 99, 1997.
[2]. Kellman, L.M. and Hillaire‐Marcel, C., “Evaluation of nitrogen isotopes as indicators of nitrate contamination sources in an agricultural watershed”. Environment, 95(3): 87‐102, 2003.
[3]. Xue, D., Botte, J., De Baets, B., Accoe, F., Nestler, A., Taylor, P., Van Cleemput, O., Berglund, M., Boeckx, P., “Present limitations and future prospects of stable isotope methods for nitrate source identification in surface- and groundwater”. Water Research 43 (5): 1159-1170, 2009.
[4]. Yevenes, M. A., Soetaert, K. and Mannaerts, C. M., “Tracing nitrate-nitrogen sources and modifications in a stream impacted by various land uses, South Portugal”, Water, 8: 385, 2016.
[5]. Kendall, C., Elliott, E.M. &Wankel, S.D., “Tracing anthropogenic inputs of nitrogen to ecosystems”. Stable isotopes in ecology and environmental science, pp.375–449, 2007.
[6]. Johannsen, A. , “Isotopic composition of nitrate in five German rivers discharging into the North Sea”. In General Assembly of the European‐Geosciences‐Union, 2007.
[7]. Kendall, C., McDonnell, J.J., “Isotope Tracers in Catchment Hydrology”. Anonymous Elsevier Science B.V, Amsterdam.p. 839, 1998.
[8]. Kendall, C., Caldwell, E.A., “Fundamentals of isotope geochemistry”. In: Kendall, C., McDonnell, J.J. (Eds.), Isotope Tracers in Catchment Hydrology. Elsevier Science B.V., Amsterdam, pp. 51-86, 1998.
[9]. Kendall, C., “Tracing nitrogen sources and cycling in catchments”. In: C. Kendall, J.J. McDonnell (Eds.), Isotope Tracers in Catchment Hydrology. Elsevier, Amsterdam, The Netherlands, pp. 519–576, 1998.
[10]. Fenech, C., Rock, L., Nolan, K., Tobin, J., Morrissey A., “The potential for a suite of isotope and chemical markers to differentiate source of nitrate contamination: A review”. Water Research 46: 2023 – 2041, 2012.
[11]. TCVN:6494-2-2000 (ISO10304-2 : 1995) Vietnam National Technical Standard on Water quality – Determination of dissolved anions by liquid chromatography of ions – Part 2: Determination of bromide, chloride, nitrate, nitrite, orthophosphate and sulphate in waste water. Ministry of Science, Technology and Environment, Ha Noi, Vietnam 2000.
[12]. Silva, S.R., Kendall, C., Wilkison, D.H., Ziegler, A. C, Chang, C.C.Y, Avanzino, R. J., “A new method for collection of nitrate from fresh water and the analysis of nitrogen and oxygen isotope ratios”. J. Hydrol. 228: 22-36, 2000.
[13]. Clark, J. S., 1955. “Solubility criteria for the existence of hydroxyapatite”. Can. J. Chem. 33: 1696-1700.
[14]. Firestone, M.K, Davidson, E.A., “Microbiological basis of NO and N2O production and consumption in soil”, p. 7-21. In: M.O. Andrea and D.S. Schimael (ed.) Exchange of trace gases between terrestrial ecosystems and the atmosphere. Joh Wiley & Sons. New York, 1989.
[15]. QCVN 08-MT: 2015/BTNMT. National Technical Regulation on surface water quality. Ministry of Natural Resources and Environment. Ha Noi, Vietnam, 2015.
[16]. Mayer. B., Boyer, E., Goodale, C., Jaworski, N., van Breemen, N., Howarth, R.W., Seitzinger, S., Billen, G., Lajtha, K., Nadelhoffer, K., van Dam, D., Hetling, L., Nosal, M., Paustian, K., “Sources of nitrate in river draining sixteen water sheds in the northeastern US: Isotopic constraints”. Biogeochem. 57/58:171-179, 2002.