@Article{CrispimNoguOmetCamp:2018:PhApDe,
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
rainwater",
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 abr. 2024"
}