Lichen specie Canoparmelia texana as bioindicator of environmental impact from the phosphate fertilizer industry of Sao Paulo, Brazil
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2014
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Journal of Radioanalytical and Nuclear Chemistry
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Resumo
The Brazilian phosphate industry is the sixth
worldwide producer of phosphate rock concentrate generating phosphoric acid, fertilizers, intermediates for fertilizers and other products. Two of the most important of
these industries are both located in the city of Cubata˜o—
Sa˜o Paulo, Brazil, and they are responsible for the production of P2O5, generating a residue known as phosphogypsum. The raw material, phosphate rock and products
are commonly transported to the industrial complex by a
railroad line and present in their composition natural radionuclides from the U and Th series and rare earth elements. Lichens have been used for monitoring atmospheric
pollution and radiological contamination for a long time
and have proven to be an important tool. This paper aims to
highlight the use of the lichen specie Canoparmelia texana
(family Parmeliacea) as a bioindicator of atmospheric
pollution by the natural radionuclides from the U and Th
series and RREs due to the operation of these industries
and the storage of their residue in the open air. Samples of
these lichen specie were collected in the vicinity of the
industries and the railroad. The radionuclides 226Ra, 228Ra
and 210Pb were measured by alpha and beta counting, after
radiochemical separation, and 238U, 232Th as well as REEs
were determined by instrumental neutron activation analysis. The results showed that the lichens present the same
fingerprint as the phosphate rock and phosphogypsum,
furthermore the cluster analysis of the results showed that
the lichen samples collected near to the railroad line presented the highest values for all the elements studied.
Como referenciar
LEONARDO, L.; DAMATTO, S.R.; GIOS, B.R.; MAZZILLI, B.P. Lichen specie Canoparmelia texana as bioindicator of environmental impact from the phosphate fertilizer industry of Sao Paulo, Brazil. Journal of Radioanalytical and Nuclear Chemistry, v. 299, n. 3, p. 1935-1941, 2014. DOI: 10.1007/s10967-013-2887-y. Disponível em: http://repositorio.ipen.br/handle/123456789/8991. Acesso em: 14 Mar 2025.
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