Study of the complexation of Cu(II) by fulvic acids extracted from a sewage sludge and its compost

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

dasilva, jcge (Autor) FCUP; machado, aasc (Autor) Outra; pinto, mssds (Autor) Outra

Revista

Título: Fresenius' Journal of Analytical Chemistry

Vol. 357

Páginas: 950-957

ISSN: 0937-0633

Editora: Springer

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 9 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-BP0

DOI: 10.1007/s002160050280

Abstract (EN): The complexation of Cu(II) by two samples of fulvic acids (FA) extracted from the raw sewage sludge (RsFA) of a waste water processing plant and from the composted sludge (CsFA) obtained upon aerobical digestion was studied at pH 6.0. Synchronous molecular fluorescence spectroscopy was used to monitor the association of FA with Cu(II) and a self-modelling mixture analysis method (SIMPLISMA) was used to preprocess the spectral data to calculate the number of components with different quenching profiles as function of the Cu(II) concentration and their spectra. The stability constants and a rough estimation of the binding site concentrations were obtained by a Stern-Volmer analysis, by a non-linear least-square method and by a linear procedure. The analysis of the SyF spectra allowed the identification of two binding sites for both samples. The logarithm of the conditional stability constant corresponding to the 1:1 complex formed between the stronger binding site and Cu(II) is about 4 for both samples.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8