author = "Crispim, Cristina P. and Nogueira, Raquel F. P. and Ometto, Jean 
                         Pierre Henry Balbaud and Campos, M. Lucia A. M.",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade Estadual 
                         Paulista (UNESP)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Universidade de S{\~a}o Paulo (USP)}",
                title = "Photo-Fenton approach for the determination of organic nitrogen in 
              journal = "Atmospheric Environment",
                 year = "2018",
               volume = "191",
                pages = "525--531",
                month = "Oct.",
             keywords = "Advanced oxidation processes, Dissolved organic nitrogen, Nitrogen 
                         biogeochemical cycle, TiO2.",
             abstract = "The importance of taking the organic forms of nitrogen (ON) into 
                         account when estimating atmospheric nitrogen deposition has been 
                         known for a long time. However, there is still only a modest 
                         amount of data on organic nitrogen in rainwater worldwide, largely 
                         due to the difficulties and uncertainties imposed by the available 
                         analytical methods. This work offers a simple, low cost, and 
                         reliable method for the determination of ON in rainwater, based on 
                         the photo-Fenton process under UV irradiation. The recovery of ON 
                         was determined using individual solutions of urea, serine, 
                         glycine, and histidine, as well as a mixture of all these 
                         compounds plus arginine. Close to 100% organic nitrogen recoveries 
                         were obtained for solutions containing 50 \μmol N 
                         L\−1, using addition of 50 \μmol L\−1 Fe2+ and 
                         2.0 mmol L\−1 H2O2, with adjustment of the pH to 
                         \∼2.5 and irradiation for 90 min. The average reagent blank 
                         was <2.0 \μmol N L\−1. The homemade reactor employed 
                         a 400 W high pressure mercury lamp, from which the external bulb 
                         had been manually removed. The reactor ventilation was controlled 
                         in order to maintain the temperature at \∼85 C. The 
                         precision of the method ranged from 1.3 to 5.7%, based on ON 
                         recovery. Rainwater collected on an event basis in Ribeir{\~a}o 
                         Preto (S{\~a}o Paulo State, Brazil) presented ON concentrations 
                         from 4.1 to 34.3 \μmol L\−1 (n = 18), corresponding 
                         to 1345% of the total nitrogen, with an average contribution of 
                         33%. Precision of \≤7.0% was obtained for the analysis of 
                         ON in rainwater.",
                  doi = "10.1016/j.atmosenv.2018.08.029",
                  url = "http://dx.doi.org/10.1016/j.atmosenv.2018.08.029",
                 issn = "1352-2310",
             language = "en",
           targetfile = "crispim_photo.pdf",
        urlaccessdate = "27 nov. 2020"