The complexation of Cu(II) by anthropogenic fulvic acids extracted from composted urban and livestock wastes

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

Autores

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

Revista

Título: Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes

Vol. 32

Páginas: 469-482

ISSN: 0360-1234

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: P-001-CP1

DOI: 10.1080/03601239709373098

Abstract (EN): The fulvic acid (fua) fractions of two samples of composted solid wastes [urban (urfua) and livestock (lsfua) wastes], commercialized to be used in agriculture as organic correctives or fertilizers, were analyzed for their affinity towards Cu(II) at pH=6. Molecular fluorescence spectroscopy (synchronous mode) was used to monitor the quenching caused by the complexation upon addition of Cu(II) to fua. Spectral data were preprocessed by a chemometric self-modeling mixture analysis method (SIMPLISMA) to detect the number of different types of fluorescent binding sites that exist in each fua, their spectra and the corresponding quenching profiles [fluorescence intensity as function of the total Cu(II) concentration]. From the analysis of the quenching profiles, the amount of binding sites (C-L) and the corresponding conditional stability constants (K') were calculated. Both fua samples have approximately C-L = 0.21 mmol/g and the logarithms of K' are 4.21(3) and 4.51(8), respectively for urfua and lsfua. The differences detected between these fua samples and those extracted from natural soils can be attributed mainly to the relatively small humification extent of the present anthropogenic fua samples.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14