Identification of sources and transformations of nitrate in Cr(VI)-impacted alluvial aquifers by a hydrogeochemical and δ 15 N-NO 3 - and δ 18 O-NO 3 - isotopes approach.

Autor: Pyrgaki K; Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, 157 84, Athens, Greece. kpyrgak@geol.uoa.gr., Kelepertzis E; Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, 157 84, Athens, Greece., Argyraki A; Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, 157 84, Athens, Greece., Boeckx P; Isotope Bioscience Laboratory-ISOFYS, Department of Green Chemistry and Technology, Ghent University, Ghent, Belgium., Botsou F; Department of Chemistry, National and Kapodistrian University of Athens, 157 84, Athens, Greece., Dassenakis E; Department of Chemistry, National and Kapodistrian University of Athens, 157 84, Athens, Greece.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Aug; Vol. 29 (38), pp. 57703-57719. Date of Electronic Publication: 2022 Mar 30.
DOI: 10.1007/s11356-022-19837-0
Abstrakt: A coupled methodology of nitrogen isotopes, hydrogeochemical characterization, multivariate statistical analysis, and SIAR Bayesian modeling has been employed to identify the sources of NO 3 - and N transformation processes in three alluvial aquifers (Schinos, Thiva, and Central Evia) located in central Greece where geogenic Cr(VI) co-occurs with agricultural activity and rural development. Hexavalent chromium concentrations exceed 50 μg/L in many sampling stations of the studied groundwater bodies, while nitrate contamination is evident in all three study areas with concentrations well over 50 mg/L. The mean δ 15 N-NO 3 - and δ 18 Ο-NO 3 - values are 6.67 ± 1.77‰ and 2.68 ± 1.77‰ in C. Evia, 8.72 ± 4.74‰ and 3.96 ± 4.57‰ in Schinos and 4.44 ± 1.71‰ and 2.91 ± 1.02‰ in Thiva, respectively. Domestic sewage and N-bearing fertilizers are contributing in various degrees to the observed nitrification which is the dominant transformation process of N in the studied aquifers. Multivariate statistics indicated that the main processes identified in the study areas are salinization, silicate dissolution, and groundwater contamination due to fertilizer use. It is suggested that ultramafic rock-related alluvial aquifers must be closely monitored in terms of nutrient inputs as an effective measure for controlling Cr(VI) release in groundwater.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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