Thermogravimetric analysis of kidney stone with monohydrate calcium oxalate
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2009
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ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 32.
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Resumo
Renal calculi with calcium oxalates
are represented by the general formula CaC2O4.xH2O,
where x is the number of bounded-water molecules,
which can vary from 1 to 2. It can be formed on crystalline seed particles of organic or inorganic compounds
that work as a nucleating substrate. Therefore, the
H2O molecule might be bound or free, depending on
if the H2O molecule belongs to the crystal structure
or the organic compound among them. Some of the
characterization techniques commonly used is not
suitable to give the structural information about
the H2O molecule. For instance, chemical, infrared
spectroscopy and thermogravimetric analysis cannot
define by itself whether the H2O molecule is structural
or interstitial. Thermogravimetric Analysis (TGA) of
kidney stones colleted from 56 donors of Vit´oria City,
Esp´ırito Santo State - southeast - Brazil was developed
in order to investigate the phase transition diagram of
calcium oxalate. X-ray powder diffraction was used as
initial technique to classify the initial composition of renal calculi. Rietveld refinement of XRD data of one
apparent monophasic (CaC2O4.xH2O or COM) renal
calculus revealed the presence of a small amount of
hydroxyapatite. The presence of this second phase and
the morphology of the stone (ellipsoidal) indicated that
this calculus can be classified as non-papillary type
and its nucleation process developed in closed kidney
cavities. The thermogravimetric Analysis of this
(CaC2O4.xH2O or COM) reveals that monohydrate
calcium oxalate presents a two phase transitions up to
600 Celcius.
Como referenciar
FERREIRA, PAULA E.; KUPLICH, LETICIA; SOUZA, DANILO O. de; ORLANDO, CINTIA G.P.; BELICH, HUMBERTO; DEPIANTI, JANAINA B.; MEDEIROS, EDNA F.; ORLANDO, MARCOS T.D.; MARTINEZ, L.G.; CORREA, H.P.S. Thermogravimetric analysis of kidney stone with monohydrate calcium oxalate. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 32., 11-15 de maio, 2009, Aguas de Lindoia, SP. Resumo... p. 58. Disponível em: http://repositorio.ipen.br/handle/123456789/22783. Acesso em: 20 Mar 2026.
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.