| Authors | Germain Esquivel-Hernández, Ioannis Matiatos, Ricardo Sánchez-Murillo, Yuliya Vystavna, Raffaella Balestrini, Naomi S. Wells, Lucilena R. Monteiro, Somporn Chantara, Wendell Walters & Leonard I. Wassenaar |
| Text | 478375 2023 10.1080/10256016.2023.2177649 Best practice guidelines isotope geochemistry nitrate ; oxygen 18 ; precipitation ; inorganic nitrogen ;standardized sampling nitrate 15 Nitrate isotopes 15N, 18O in precipitation best practices from an international coordinated research project Germain Esquivel Hernandez, Ioannis Matiatos, Ricardo Sanchez Murillo, Yuliya Vystavna, Raffaella Balestrini, Naomi S. Wells, Lucilena R. Monteiro, Somporn Chantara, Wendell Walters Leonard I. Wassenaar Stable Isotopes Research Group and Water Resources Management Laboratory, Universidad Nacional Costa Rica, Heredia, Costa Rica; Hellenic Centre for Marine Research, Anavissos Attikis, Greece; Department of Earth and Environmental Sciences, University of Texas, Arlington, TX, USA; International Atomic Energy Agency, Isotope Hydrology Section, Vienna International Centre, Vienna, Austria; Water Research Institute, National Research Council CNR IRSA , Brugherio, MB, Italy; Faculty of Environmental Science Engineering, Southern Cross University, Lismore, NSW, Australia; Instituto de Pesquisas Energeticas e Nucleares, IPEN/CNEN, Cidade Universitaria, São Paulo, SP, Brazil; Environmental Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand; Institute at Brown for Environment and Society, Brown University, Providence, RI, USA; Department of Soil and Physical Sciences, Lincoln University, Lincoln, New Zealand; WasserCluster Lunz, Lunz am See, Austria Stable isotope ratios of nitrogen and oxygen 15N/14N and 18O/16O of nitrate NO3 are excellent tracers for developing systematic understanding of sources, conversions, and deposition of reactive atmospheric nitrogen Nr in the environment. Despite recent analytical advances, standardized sampling of NO3 isotopes in precipitation is still lacking. To advance atmospheric studies on Nr species, we propose best practice guidelines for accurate and precise sampling and analysis of NO3 isotopes in precipitation based on the experience obtained from an international research project coordinated by the International Atomic Energy Agency IAEA . The precipitation sampling and preservation strategies yielded a good agreement between the NO3 concentrations measured at the laboratories of 16 countries and at the IAEA. Compared to conventional methods e.g., bacterial denitrification , we confirmed the accurate performance of the lower cost Ti III reduction method for isotope analyses 15N and 18O of NO3 in precipitation samples. These isotopic data depict different origins and oxidation pathways of inorganic nitrogen. This work emphasized the capability of NO3 isotopes to assess the origin and atmospheric oxidation of Nr and outlined a pathway to improve laboratory capability and expertise at a global scale. The incorporation of other isotopes like 17O in Nr is recommended in future studies. Published version Nitrate isotopes 15N, 18O in precipitation best practices from an international coordinated research project IsotopeTaylor Francis2023_Nitrate isotopes 15N 18O in precipitation best practices from an international coordinated research project.pdf Articolo in rivista Gordon and Breach 1477 2639 Isotopes in environmental and health studies Online Isotopes in environmental and health studies Online Isot. environ. health stud. Online Isotopes in environmental and health studies Online raffaella.balestrini BALESTRINI RAFFAELLA |
