Rare earth elements, U and Th in tunnel dusts of São Paulo city, Brazil
DOI:
https://doi.org/10.15392/bjrs.v7i2A.569Keywords:
Tunnel dusts, rare earth elements, INAAAbstract
São Paulo is one of the most populated cities in the world, with about 20 million inhabitants in its metropolitan area, more than 12 million motor vehicles and intense industrial activity. Given its importance as a major urban center in South America and the lack of information concerning urban dust composition, the present study aimed to determine rare earth elements (REEs), U and Th mass fractions in tunnel dust, collected in the Jânio Quadros Tunnel, and to assess their possible sources. The study of REEs distribution in urban environments has become of interest over the last decades, due to the increasing industrial use of these elements. The REEs, that are as common as the most familiar metals, are found in metallurgical additives, fluid cracking catalysts and automobile converter catalysts, among other applications. In this study, which employed Instrumental Neutron Activation Analysis (INAA) as analytical technique, the mass fractions of eight REEs were determined and normalized to the chondrite concentration values. The results showed that major concentrations were found for light REEs, following the sequence Ce > La > Nd > Sm > Yb > Eu > Tb > Lu. The pattern of the results pointed to a natural origin for these elements. Regarding U and Th concentrations, the results varied between 1.0 – 9.4 µg g-1 and 3.3 – 35.9 µg g-1, respectively. Since there is almost no information about the concentration of these elements in this kind of matrix in São Paulo city, these data are important to support further investigations.
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References
ZHENG, T.; HE, J.; ZHAO, Y.; XIA, W.; HE, J. Precious Metal-Support Interaction in Automotive Exhaust Catalysts. Journal of Rare Earths, v. 32 (2), p. 97–107, 2014.
HARRISON, B. B.; DIWELL, A. F.; HALLETT, C. Promoting platinum metals by ceria-metalsupport interactions in autocatalysts. Platinum Metals Review, n. 32, p. 73–83, 1988.
RIM, K. Effects of Rare Earth Elements on the environment and human health: a literature review. Toxicology and Environmental Health Sciences, v. 8, p. 189–200, 2016.
PAGANO, G.; GUIDA, M.; TOMMASI, F.; ORAL, R. Health effects and toxicity mechanisms of rare earth elements—knowledge gaps and research prospects. Ecotoxicology and Environmental Safety, v. 115, p. 40–48, 2015.
DENATRAN. Frota de Veículos - 2017. Available at: <http://www.denatran.gov.br/images/Estatistica/RENAVAM/2017/Junho/3_-_Combustível_-_JUNHO_-_2017.xls>. Last accessed: 12 Sept. 2017.
CAMARGO, S. P.; FIGUEIREDO, A. M. G.; SÍGOLO, J. B. Uranium and thorium in urban park soils of São Paulo, In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, 2009, Rio de Janeiro. Annals. Rio de Janeiro: Comissão Nacional de Energia Nuclear, 2009.
FIGUEIREDO, A. M. G.; CAMARGO, S. P.; SÍGOLO, J. B. Determination of REE in urban park soils from São Paulo city for fingerprint of traffic emission contamination, In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, 2009, Rio de Janeiro. Annals. Rio de Janeiro: Comissão Nacional de Energia Nuclear, 2009.
RIBEIRO, A. P.; FIGUEIREDO, A. M. G.; TICIANELLI, R. B.; NAMMOURA-NETO, G. M.; SILVA, N. C.; KAKAZU, M. H.; ZAHN, G. S. Metals and semi-metals in street soils of São Paulo city, Brazil. Journal of Radioanalytical and Nuclear Chemistry, v. 291 (1), p. 137–42, 2012.
BARDELLI, F.; CATTARUZZA, E.; GONELLA, F.; RAMPAZZO, G; VALOTTO, G. Characterization of road dust collected in Traforo Del San Bernardo highway tunnel: Fe and Mn speciation. Atmospheric Environment, v. 45 (35), p. 6459–6468, 2011.
GUNEY, M.; ONAY, T. T.; COPTY, N. K. Impact of overland traffic on heavy metal levels in highway dust and soils of Istanbul, Turkey. Environmental Monitoring and Assessment, v 164 (1–4), p. 101–10, 2010.
VARRICA, D.; DONGARRÀ, G.; SABATINO, G.; MONNA, F. Inorganic geochemistry of roadway dust from the metropolitan area of Palermo, Italy. Environmental Geology, v. 44, p. 222–30, 2003.
PALME, H.; O’NEILL, H. Cosmochemical estimates of mantle composition. In: Holland, H. D.; Turekian, K. K. Treatise on Geochemistry, 2nd ed., v. 3. Elsevier, 2013. p. 1-39.
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