Chemical characterization of the clay deposit known as peruvian black mud
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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In Peruíbe city, state of São Paulo, the largest continuous natural deposit of clay
in the world can be found, containing of a material popularly known as Peruíbe Black
Mud (PBM). This deposit has 83 thousand tons with a depth of 75m, distributed
in 5 hectares, making the municipality a tourist point. This sludge is characterized
by large amounts of fine particles, high organic matter content, high sulfite reducing
bacteria content and a consequent high ion reduction potential; it is used in psoriasis,
peripheral dermatitis, acne and seborrhea treatments, as well as in myalgias,
arthritis and non-rheumatic joint processes. Ten samples of the in natura mud were
collected along the deposit, in depth ranging from 1 to 1.5m and also 6 samples
that were matured with see water, with the objective of verifying the homogeneity
of the chemical composition through the evaluation of its elemental content, for the
physical-chemical characterization, measurements of pH, moisture, organic matter
and loss on ignition were made. The elemental concentrations were determined by neutron activation analysis. In these measurements approximately 100mg of sample
were irradiated together with certified reference materials, for a period of 8 hours under
a neutron flux in the order of 1012 n cm2 s1. The activities were determined by
gamma spectrometry using high-purity Ge detectors. Both, in natura and maturated
samples presented similar coefficient of variation for most of the elements, with Ca,
Co, Cr, Cs, Fe, La, Th and U having a coefficient of variation lower than 30%, the
elements As, Sm, Tb, Zn and Zr presented a coefficient of variation between 30 and
60% and the elements K, Nd, Sb, Se, Tb and Yb presented the highest coefficients
of variation, above 60%.
Como referenciar
ALVES, I.C.; GOUVEA, P.F.M.; SILVA, P.S.C. Chemical characterization of the clay deposit known as peruvian black mud. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 28-29. Disponível em: http://repositorio.ipen.br/handle/123456789/28723. Acesso em: 20 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.