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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/11923
Título

Multivariate curve resolution of multidimensional excitation–emission quenching matrices of a Laurentian soil fulvic acid

AutorEsteves da Silva, Joaquim C. G.; Tavares, Maria J. C. G.; Tauler, Romà
Palabras claveFulvic acids
Fluorescence excitation–emission matrices (EEM)
Quenching profiles
Cu(II) complexation
Multivariate curve resolution (MCR)
Stability constants
Fecha de publicación21-feb-2006
EditorElsevier
CitaciónChemosphere 64(11): 1939-1948 (2006)
ResumenFluorescence excitation–emission matrices (EEM) of aqueous solutions of Laurentian soil fulvic acid (LFA) at three concentrations (50, 75 and 100 mg/l) were obtained at two pH values (pH = 4.0 and 6.0) and as function of the Cu(II) ion concentration. The presence of Cu(II) ion provokes quenching of the intrinsic LFA fluorescence due to complex formation. Multivariate curve resolution (MCR-ALS) was used to successfully decompose single EEM into excitation and emission spectra for the detected components. Moreover, multidimensional (up to six dimensions) data matrices were generated by adding EEM collected as function of the LFA and Cu(II) concentrations and pH. MCR-ALS was able to resolve the excitation and emission spectra from these multidimensional data matrices given further information about the spectral variation profiles induced by the experimental factors. Conditional stability constants (log K-LFACu) were calculated from the quenching profiles observed as function of the Cu(II) concentration, as well as, their trends as function of pH and LFA concentration were obtained – average (and standard deviation) of log K-LFACu = 4.6 ± 0.2. This EEM/MCR-ALS methodology constitutes a new tool for the study of natural organic matter under varying experimental conditions that characterize natural environmental systems.
Descripción10 pages, 6 figures, 3 tables.-- PMID: 16494927 [PubMed].-- Printed version published Sep 2006.
Versión del editorhttp://dx.doi.org/10.1016/j.chemosphere.2006.01.027
URIhttp://hdl.handle.net/10261/11923
DOI10.1016/j.chemosphere.2006.01.027
ISSN0045-6535
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