Evolving Factor Analysis of Synchronous Fluorescence Spectra of Fulvic Acids in the Presence of Aluminum

• Type: Article in International Scientific Journal
• Date: 1994

Authors

Silva, CSPCO (Author) Other; Joaquim C G E Esteves da Silva (Author) FCUP; Machado, AASC (Author) Other

Journal

Title: Applied Spectroscopy

Vol. 48

Pages: 363-372

ISSN: 0003-7028

Publisher: SAGE

Indexing

Scopus - 51 Citations

Other information

Authenticus ID: P-00W-7D4

DOI: 10.1366/0003702944028281

Abstract (EN): The variations observed in synchronous fluorescence spectra of aqucous solutions (pH = 4) of three fuivic acids (fua) upon variation of the concentration of Ai¿ were anaiyzed by evoiving factor anaiysis (EFA). The three fua samples were extracted from materiais present in a pine wood sou: dry pine needies and the upper and iower sou horizons. The presence of AI¿ induces quenching and eahancement of bands in the synchronous fluorescence spectra, and concentration constraints are pro posed for lhe EFA anaiysis that allow lhe caicuiation, on a seif-modeiing curve resolution basis, of the number of components that show iineariy independent variations, their spectra, and corresponding concentration profiles. Simuiated and experimentai data seta of simpie known com pounds (catechoi, catfeic acid, sahcyiic acid, and morin) were aiso studied as the first vaiidation of the experimental and data treatment procedures. © 1994 SocieLy for Applicd Spectroscopy.

Language: English

Type (Professor's evaluation): Scientific