Issue 5, 2009
From the journal:

Photochemical & Photobiological Sciences

UV photoinitiated changes of humic fluorophores, influence of metal ions†

S. Klementová,*a   D. Kříž,a   J. Kopáček,b   F. Novákc  and  P. Porcalb  

* Corresponding authors

a Faculty of Science, Univ. South Bohemia, České Budějovice, Czech Republic
E-mail: sklement@jcu.cz

b Biology Centre ASCR, Hydrobiological Institute, České Budějovice, Czech Republic

c Biology Centre ASCR, Institute of Soil Biology, České Budějovice, Czech Republic

Abstract

Fluorophore types and their photochemical stability have been tested in two samples of humic acids (HA) and four types of fulvic acids (FA) extracted from upper soil horizons (O and A horizons) in Norway spruce forest mountain ecosystems. Only one type of fluorophore occurred in all samples, with an excitation maximum at 310 nm for both HA and FA samples and emission maxima between 420–435 and 440–450 for HA and FA, respectively. HA weak native fluorescence increased significantly during irradiation in the first 12 h. Fluorophores in FA were uniformly degraded from the beginning of irradiation. Addition of metal (aluminium or ferric) ions did not affect the positions of fluorescence maxima in any of the studied samples; mild effects on fluorescence intensities were observed.

Graphical abstract: UV photoinitiated changes of humic fluorophores, influence of metal ions

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Article information

DOI
https://doi.org/10.1039/B817044D
Article type
Paper
Submitted
30 Sep 2008
Accepted
05 Dec 2008
First published
06 Jan 2009

Photochem. Photobiol. Sci., 2009,8, 582-586

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UV photoinitiated changes of humic fluorophores, influence of metal ions

S. Klementová, D. Kříž, J. Kopáček, F. Novák and P. Porcal, Photochem. Photobiol. Sci., 2009, 8, 582 DOI: 10.1039/B817044D

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