Lixiviation of natural radionuclides and heavy metals in tropical soils amended with phosphogypsum

Autor(es)

Nisti, M. B. ^[1] ; Saueia, C. R. ^[1] ; Malheiro, L. H. ^[1] ; Groppo, G. H. ^[1] ; Mazzilli, B. P. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL RADIOACTIVITY; v. 144, p. 120-126, JUN 2015.
• Citações Web of Science: 13

Resumo

The main phosphate industries in Brazil are responsible for the annual production of 5.5 million tons of a residue (phosphogypsum), which is stored in stacks. The presence of radionuclides and metals puts restrictions on the use of phosphogypsum in agriculture. To assure a safe utilization, it is important to estimate the lixiviation of the radionuclides (U-238, Ra-226, Pb-210, Po-210, Th-232 and Ra-228) and metals (As, Cd, Cr, Ni, Se, Hg and Pb) present in phosphogypsum. For this purpose, an experiment was carried out, in which columns filled with sandy and clay Brazilian typical soils mixed with phosphogypsum were percolated with water, to achieve a mild extraction of these elements. The results obtained for the concentration of the radionuclides and metals in the leachate were low; giving evidence that, even when these elements are present in the phosphogypsum, they do not contribute to an enhancement of their content in water. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/10587-0 - Lixiviação de metais e radionuclídeos em colunas de solos tropicais condicionados com gesso agrícola
• Beneficiário: Barbara Paci Mazzilli
• Modalidade de apoio: Auxílio à Pesquisa - Regular