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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/37088
Título: 
Lability of heavy metal species in aquatic humic substances characterized by ion exchange with cellulose phosphate
Autor(es): 
Instituição: 
  • INST SPECTROCHEM & APPL SPECT
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0039-9140
Resumo: 
Labile metal species in aquatic humic substances (HSs) were characterized by ion exchange on cellulose phosphate (CellPhos) by applying an optimized batch procedure. The HSs investigated were pre-extracted from humic-rich waters by ultrafiltration and a resin XAD 8 procedure. The HS-metal species studied were formed by complexation with Cd(II), Ni(II), Cu(II), Mn(II) and Pb(II) as a function of time and the ratio ions to HSs. The kinetics and reaction order of this exchange process were studied. At the beginning (<3 min), the labile metal fractions are separated relatively quickly. After 3 min, the separation of the metal ions proceeds with uniform half-lives of about 12-14 min, revealing rather slow first-order kinetics. The metal exchange between HSs and CellPhos exhibited the following order of metal lability with the studied HSs: Cu > Pb > Mn > Ni > Cd. The required metal determinations were carried out by atomic absorption spectrometry.
Data de publicação: 
1-Jan-1997
Citação: 
Talanta. Amsterdam: Elsevier B.V., v. 44, n. 1, p. 69-74, 1997.
Duração: 
69-74
Publicador: 
Elsevier B.V.
Palavras-chaves: 
  • aquatic humic substances
  • cellulose phosphate
  • heavy metal species
  • ion exchange
  • lability
Fonte: 
http://dx.doi.org/10.1016/S0039-9140(96)02017-6
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/37088
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