FACTOR-ANALYSIS OF MOLECULAR FLUORESCENCE DATA OF MARINE AND SOIL FULVIC-ACIDS

• Type: Article in International Scientific Journal
• Date: 1993

Authors

machado, aasc (Author) Other; dasilva, jcge (Author) FCUP

Journal

Title: Chemometrics and Intelligent Laboratory Systems

Vol. 19

Pages: 155-167

ISSN: 0169-7439

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 39 Citations

Scopus - 39 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-001-MZR

DOI: 10.1016/0169-7439(93)80099-4

Abstract (EN): The variations observed in synchronous fluorescence spectra of fulvic acids have been characterised by principal component analysis and evolving factor analysis. Fulvic acids from coastal marine waters (mfua) were examined as a function of pH (between 2 and 7) and Cu(II) concentration. Fulvic acids from soil (sfua) were examined as a function of pH (between 2 and 7) and Cu(II), Co(II) and Ni(II) concentration. Fluorescence properties of sfua are characterised by a constant plus three varying components (defined by three individual spectra), corresponding to three acid-base equilibria with pK(a) values of 3.0, 4.6 and 6.4. For mfua, a constant plus two varying components (defined by three individual spectra) were detected, corresponding to two acid-base equilibria with pK(a) values of 3.1 and 5.3. The influence of the ions on the acid-base equilibrium diagrams is also quantified.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13