Integrating stable isotopes and factor analysis to delineate the groundwater provenance and pollution sources in the northwestern part of the Amman-Al Zarqa Basin, Jordan  

作　　者：Mutawakil OBEIDAT Ahmad AL-AJLOUNI Eman BANI-KHALED Muheeb AWAWDEH Muna ABU-DALO 

机构地区：[1]Basic Sciences and Humanities Department,Faculty of Science and Arts,Water Diplomacy Centre,Jordan University of Science and Technology,Irbid 22110,Jordan [2]Chemistry Department,Jordan University of Science and Technology,Irbid 22110,Jordan [3]Laboratory of Applied Geoinformatics,Department of Earth and Environmental Sciences,Yarmouk University,Irbid 21163,Jordan

出　　处：《Journal of Arid Land》2023年第12期1490-1509,共20页干旱区科学（英文版）

基　　金：funded by the Deanship of Scientific Research,Jordan University of Science and Technology(20210159).

摘　　要：Globally,groundwater contamination by nitrate is one of the most widespread environmental problems,particularly in arid and semiarid areas,which are characterized by low amounts of rainfall and groundwater recharge.The stable isotope composition of groundwater(δ2H-H2O andδ18O-H2O)and dissolved nitrate(δ15N-NO3–andδ18O-NO3–)and factor analysis(FA)were applied to explore groundwater provenance,pollution,and chemistry evolution in the northwestern part of the Amman-Al Zarqa Basin,Jordan.In this study,we collected 23 samples from the Lower Ajloun aquifer in 2021,including 1 sample from a groundwater well and 22 samples from springs.These samples were tested for electrical conductivity,total dissolved solids,pH,temperature,dissolved oxygen,the concentration of major ions(Ca2+,Mg2+,Na+,K+,HCO3–,Cl–,SO42–,and NO3–),and the stable isotope composition of groundwater and dissolved nitrate.The results revealed that groundwater in the study area is mainly Ca–Mg–HCO3 type and can be classified as fresh water,hard water,and very hard water.The range and average concentration of NO3–were 3.5–230.8 and 50.9 mg/L,respectively.Approximately 33%of the sampling points showed NO3–levels above the maximum allowable concentration of 50.0 mg/L set by the World Health Organization(WHO)guidelines for drinking water quality.The values ofδ18O-H2O andδ2H-H2O showed that groundwater in the study area is part of the current water cycle,originating in the Mediterranean Sea,with significant evaporation,orographic,and amount effects.The values of the stable isotope composition of NO3–corresponded toδ15N-NO3–andδ18O-NO3–values produced by the nitrification process of manure or septic waste and soil NH4+.The FA performed on the hydrochemical parameters and isotope data resulted in three main factors,with Factor 1,Factor 2,and Factor 3,accounting for 50%,21%,and 11%of the total variance,respectively.Factor 1 was considered human-induced factor,named"pollution factor",whereas Factor 2,named"conservative fingerprint

关 键 词：stable isotope composition δ15N-NO3– δ18O-NO3– groundwater quality pollution sources JORDAN 

分 类 号：X523[环境科学与工程—环境工程]