Study of acid-base properties of fulvic acids using fluorescence spectrometry and multivariate curve resolution methods |
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| Authors: | E. Casassas, I. Marqu s,R. Tauler |
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| Affiliation: | Department of Analytical Chemistry, University of Barcelona, Diagonal 647, Barcelona E-08028, Spain |
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| Abstract: | Samples of fulvic acids obtained from cultivated calcareous soils are analyzed using acid-base titrations with spectrofluorimetric detection. Observed changes in both synchronous and emission spectra of fulvic acids when pH is changed are explained in terms of a limited number of fluorescent contributions each defined by its specific fluorescent spectrum and a concentration profile (species distribution) recovered from the multivariate curve resolution analysis of experimental data. Information on equilibrium is estimated from concentrations of the acid-base species. |
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| Keywords: | Principal component analysis Fluorimetry Acid-base Multivariate curve resolution Fulvic acids |
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