Study of dynamic behavior of EDTA molecule in solution using perturbed gamma-gamma angular correlation spectroscopy
Carregando...
Data
Data de publicação
2009
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st
Exportar
Resumo
In this work, PAC spectroscopy has been used to obtain the hyperfine parameters in EDTA molecules in
solutions with pH 4.3 and pH 10.5 both measured at 77 K and 295 K using 181Hf(181Ta) as probe nuclei. Both
dynamic and static interactions were measured in aqueous solution, crystallized and re-hydrated samples in
order to examine the motion and structure of EDTA-molecules. The hyperfine parameters, quadrupole
interaction frequency (νQ), asymmetry (η), and the dynamic interaction frequency (λ) were obtained. The
outcomes show that the rotational correlation time (τCR) is larger than the half-life of the intermediate state of
probe nuclei. For samples with pH 4.3 and pH 10.5, it was observed an increase in νQ when the temperature
decreases, as expected, and also a variation of η, which is an evidence of a change in the EDTA molecule
structure. 181Hf is bound only to a single molecule site when the pH was 4.3, differently from the results for pH
10.5 sample, which showed two fractions with different νQ indicating the possibility of 181Hf being bonded to
two different sites of the molecule. Measurements of the dehydrated sample presented different results leading
us to conclude that the preparation procedure can causes alterations in the chemical bounds. Concluding, these
results showed a systematic behavior of the 181Hf-EDTA, with the variation of pH from 4 to approximately 11,
and they are important to the knowledge of the dynamic behavior of this molecule.
Como referenciar
AMARAL, ANTONIO A.; SILVA, ANDREIA S.; CARBONARI, ARTUR W.; LAPOLLI, ANDRE L. Study of dynamic behavior of EDTA molecule in solution using perturbed gamma-gamma angular correlation spectroscopy. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st, September 27 - October 2, 2009, Rio de Janeiro, RJ. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/12289. Acesso em: 29 Apr 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.