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Source identification of nitrate in the upper aquifer system of the Wadi Shueib catchment area in Jordan based on stable isotope composition

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Journal of Arid Land 2021年第4期13卷 350-374页

作者： Mutawakil OBEIDAT Muheeb AWAWDEH Noor AL-KHARABSHEH Ahmad AL-AJLOUNI Faculty of Science and Arts Jordan University of Science and TechnologyIrbid 22110Jordan Laboratory of Applied Geoinformatics Department of Earth and Environmental SciencesYarmouk UniversityIrbid 21163Jordan Department of Water Resources and Environmental Management Al-Balqa Applied UniversityAl-Salt 19117Jordan

Groundwater forms the main freshwater supply in arid and semi-arid areas,and contamination of this precious resource is complicated by the slow rate of recharge in these *** contamination of groundwater is a global water quality problem,as it entails threat to human health as well as aquatic *** identification of contamination is the cornerstone and a prerequisite for any effective management program of water *** isotope composition of the dissolved nitrate(δ^(15)N-NO_(3)-andδ^(18)O-NO_(3)-)has been applied to identify NO_(3)-sources and the main transformation processes in the upper aquifer system(A1/2,A4,and B2/A7 aquifers)in the Wadi Shueib catchment area,***,the stable isotope compositions of the groundwater(δ^(2)H-H_(2)O andδ^(18)O-H_(2)O)in conjunction with the groundwater hydrochemistry were integrated to investigate the origin and evolution of the *** revealed that groundwater in the study area is fresh and hard-very hard water,and mainly a Ca-Mg-Cl ***_(3)-concentration was in the range of 7.0-74.0 mg/L with an average of 37.0 mg/*** of the samples showed concentration higher than the natural background concentration of NO_(3)-(5.0-10.0 mg/L).Theδ^(2)H-H_(2)O andδ^(18)O-H_(2)O values indicated that the groundwater is meteoric,and of Mediterranean origin,with a strong evaporation ***δ^(15)N-NO_(3)-values ranged between 6.0‰and 11.3‰with an average of 8.7‰,and theδ^(18)O-NO_(3)-values ranged between 1.6‰and 5.9‰with an average of 3.4‰.These values are in conformity with the stable isotope composition of nitrate derived the nitrification of wastewater/manure,and soil *** and denitrification are the main transformation processes affecting nitrogen *** analysis revealed no significant differences in theδ^(2)H-H_(2)O andδ^(18)OH_(2)O values,andδ^(15)N-NO_(3)-andδ^(18)O-NO_(3)-values for the three aquifers(A1/2,A4,and B2/A7),indicating that the groundwater of

关键词： δ^(15)N-NO_(3)– δ^(18)O-NO_(3)– nitrate sources pollution meteoric origin aquifer Jordan

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