Alavi M (1994) Tectonics of the Zagros orogenic belt of Iran; new data and interpretations. Tectonophysics 229:211-238 (In Persian)
Amberger A and Schmidt HL (1987) The natural isotope content of nitrate as an indicator of its origin. Geochimica et Cosmochimica Acta 51(10):2699-2705
Amiri H, Zare M and Widory D (2015) Nitrate nitrogen and oxygen isotope characterization of the Shiraz Aquifer (Iran). Procedia Earth and Planetary Science 13:52-55
Andersson KK and Hooper AB (1983) O2 and H2O are each the source of one O in NO2 produced from NH3 by Nitrosomonas: 15N-NMR evidence. FEBS Lett 164(2):236–240
Barnes RT and Raymond PA (2010) Land-use controls on sources and processing of nitrate in small watersheds: insights from dual isotopic analysis. Ecological Applications 20(7):1961-1978
Bateman AS and Kelly SD (2007) Fertilizer nitrogen isotope signatures. Isotopes in Environmental and Health Studies 43(3):237-247
Bu HM, Song XF, Zhang Y and Meng W (2017) Sources and fate of nitrate in the Haicheng River basin in Northeast China using stable isotopes of nitrate. Ecological Engineering 98(C):105-113
Casciotti KL, Sigman DM, Hastings MG, Böhlke JK and Hilkert A (2002) Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method. Analytical Chemistry 74(19):4905-4912
Chen ZX, Yu L, Liu WG, Lam MH, Liu GJ and Yin XB (2014) Nitrogen and oxygen isotopic compositions of water-soluble nitrate in Taihu Lake water system, China: implication for nitrate sources and biogeochemical process. Environmental Earth Sciences 71(1):217-223
Clark I (2015) Groundwater geochemistry and isotopes. CRC Press, Boca Raton, Florida, 230p
Cook GA and Lauer CM (1968) Oxygen. In: Hampel CA (ed) The Encyclopedia of the chemical elements. Reinhold Book Corporation, New York, 499p
Fang YT, Koba K, Makabe A and Zhu FF (2012) Low 18O values of nitrate produced from nitrification in temperate forest soils. Environmental Science and Technology 46:8723-8730
Galloway JN, Townsend AR, Erisman JW, Bekunda M, Cai Z, Freney JR and Sutton MA (2008) Transformation of the nitrogen cycle: recent trends, questions, and potential solutions. Science 320(5878):889-892
Gammons CH, Poulson SR, Pellicori DA and Reed PJ (2006) The hydrogen and oxygen isotopic composition of precipitation, evaporated mine water, and river water in Montana. USA Journal Hydrolohy 328:319-330
Gonfiantini R (1978) Standards for stable isotope measurements in natural compounds. Nature 271:534-536
Haddadan M and Mohammadian H (2006) Geological map of Varamin sheet (1: 100,000). Geological Survey of Iran, Tehran (In Persian)
Hollocher TC (1984) Source of the oxygen atoms of nitrate in the oxidation of nitrite by Nitrocacter agilis and evidence against a P-O-N anhydride mechanism in oxidative phosphorylation. Arch Biochem Biophys 233(2):721-727
Hosseinimarandi H, Mohammadnia M, Rousta MJ and Hataf B (2012) Study the groundwater nitrate pollution in the Mian-Jungle region, Fasa,Iran. Iran Water Resources Research 8(3):88-92 (In Persian)
Jin Z, Qin X, Chen L, Jin M and Li F (2015) Using dual isotopes to evaluate sources and transformations of nitrate in the West Lake watershed, eastern China. Journal of Contaminant Hydrology 177:64-75
Jin Z, Pan Z, Jin M, Li F, Wan Y and Gu B (2012) Determination of nitrate contamination sources using isotopic and chemical indicators in an agricultural region in China. Agriculture, Ecosystems and Environment 155:78-86
Junk G and Svec HJ (1958) The absolute abundance of the nitrogen isotopes in the atmosphere and compressed gas from various sources. Geochim Cosmochim Acta 14(3):234-243
Kaushal SS, Groffman PM and Band LE (2011) Tracking nonpoint source nitrogen pollution in human-impacted watersheds. Environment Science Technology 45(19):8225-8232
Kendall C (1998) Tracing nitrogen sources and cycling in catchments. Isotope Tracers in Catchment Hydrology, 521P
Kendall C, Elliott EM and Wankel SD (2007) Tracing anthropogenic inputs of nitrogen to ecosystems. Stable Isotopes in Ecology and Environmental Science 2:375-449
Kohl DH, Shearer GB and Commoner B (1971) Fertilizer nitrogen: contribution to nitrate in surface water in a corn belt watershed. Science 174(4016):1331-1334
Korth F, Deutsch B, Frey C, Moros C and Voss M (2014) Nitrate source identification in the Baltic Sea using its isotopic ratios in combination with a Bayesian isotope mixing model. Biogeosciences 11(17):4913-4924
Korth F, Fry B, Liskow I and Voss M (2013) Nitrogen turnover during the spring outflows of the nitrate-rich Curonian and Szczecin lagoons using dual nitrate isotopes. Marine Chemistry154:1-11
Liu CQ, Li SL, Lang YC and Xiao HY (2006) Using delta N-15 and delta O-18 values to identify nitrate sources in karst ground water, Guiyang, Southwest China. Environmental Science and Technology 40:6928-6933
Li S L, Liu CQ, Xiao HY, Tao F X, Lang BC and Han GL (2005) Using δ 15N to assess groundwater nitrogen pollution in Guiyang. Geochimica 34(3):257-262
Mattern S, Sebilo M and Vanclooster M (2011) Identification of the nitrate contamination sources of the Brusselian sands groundwater body (Belgium) using a dual-isotope approach. Isotopes in Environmental and Health Studies 47(3):297-315
Ma G, Wang Y, Bao X, Hu Y, Liu Y, He L and Meng F (2015) Nitrogen pollution characteristics and source analysis using the stable isotope tracing method in Ashi River, northeast China. Environmental Earth Sciences 73(8):4831-4839
Mayer B, Boyer EW, Goodale C, Jaworski NA, Van Breemen N, Howarth RW and Van Dam D (2002) Sources of nitrate in rivers draining sixteen watersheds in the northeastern US: Isotopic constraints. Biogeochemistry 57(1):171-197
Nassery HR, Khodaei K, Mohammadzade H and Shahsavari AA (2012) Investigation on groundwater nitrate contamination and contamination source determination of Dezful-Andimeshk using 15N and 18O isotopes. Iran Geology Journal 22(6):93-111 (In Persian)
Atarzadeh AA, Tavana B and Abrazi B (2014) Quanlitative and contamination studies of Varamin aquifer (Groundwater studies). Yekom Consulting Engineer, 78P (In Persian)
Sigman DM, Casciotti KL, Andreani M, Barford C, Galanter MBJK and Böhlke JK (2001) A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater. Analytical Chemistry 73(17):4145-4153
Solgi E and Oroji B (2018) A survey of nitrate and nitrite concentrations in groundwaters of urban and agricultural areas of the Asadabad Plain. Iran Water Resources Research 13(4):161-167 (In Persian)
Sun Z, Mou X, Li X, Wang L, Song H and Jiang H (2011) Application of stable isotope techniques in studies of carbon and nitrogen biogeochemical cycles of ecosystem. Chinese Geographical Science 21(2):129-148
Vavilin VA and Rytov SV (2015) Nitrate denitrification with nitrite or nitrous oxide as intermediate products: stoichiometry, kinetics and dynamics of stable isotope signatures. Chemosphere 134:417-426
Vitòria L, Otero N, Soler A and Canals À (2004) Fertilizer characterization: isotopic data (N, S, O, C, and Sr). Environmental Science and Technology 38(12):3254-3262
Wankel SD, Kendall C and Paytan A (2009) Using nitrate dual isotopic composition (δ15N andδ18O) as a tool for exploring sources and cycling of nitrate in an estuarine system: Elkhorn Slough, California. Journal of Geophysical Research: Biogeosciences, 114p
Wassenaar LI, Athanasopoulos P and Hendry MJ (2011) Isotope hydrology of precipitation, surface and ground waters in the Okanagan Valley, British Columbia. Canada Journal Hydrology 411(1–2):37-48
Wong WW, Grace MR and Cartwright I (2015) Unravelling the origin and fate of nitrate in an agricultural–urban coastal aquifer. Biogeochemistry 122:343-360
World Health Organization (2010) Guidelines for drinking-water quality. Journal of Hydrology 45:936-47
Xu S, Kang P and Sun Y (2016) A stable isotope approach and its application for identifying nitrate source and transformation process in water. Environmental Science and Pollution Research 23(2):1133-1148
Xue D, De Baets B, Botte J, Vermeulen J, Van Cleemput O and Boeckx P (2010) Comparison of the silver nitrate and bacterial denitrification methods for the determination of nitrogen and oxygen isotope ratios of nitrate in surface water. Rapid Communications in Mass Spectrometry 24(6):833-840
Xue D, Botte J, De Baets B, Accoe F, Nestler A, Taylor P and Boeckx P (2009) Present limitations and future prospects of stable isotope methods for nitrate source identification in surface-and groundwater. Water Research 43(5):1159-1170
Xue DM, Baets BD, Cleemput OV and Hennessy MB (2012) Use of a Bayesian isotope mixing model to estimate proportional contributions of multiple nitrate sources in surface water. Environmental Pollution 161(1):43-49
Zhang Y, Liu XJ, Fangmeier A, Goulding KTW and Zhang FS (2008) Nitrogen inputs and isotopes in precipitation in the North China Plain. Atmospheric Environment 42:1436-1448
)