Photoinductive efficiency of soil extracted humic and fulvic acids.
Chemosphere
; 49(3): 259-62, 2002 Oct.
Article
in En
| MEDLINE
| ID: mdl-12363303
ABSTRACT
Humic and fulvic acids extracted from soils of different genesis were investigated for their ability to photoinduce the transformation of fenuron (2 x 10(-4) mol(-1)) at 365 nm. The ratio of the initial rate of fenuron consumption over the rate of light absorption by humic substances was found to be higher for fulvic acids (range 2.0 x 10(-3) to 9.0 x 10(-5)) than for humic acids (range 1.7 x 10(-4) to - 3.6 x 10(-5)). Within the FAs population, this ratio decreased as the specific absorption coefficient at 365 nm increased. It seems therefore that most of 365-nm absorbing components have no photoinductive activity and even reduce that of photoinductive chromophores.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Photochemistry
/
Benzopyrans
/
Humic Substances
Language:
En
Journal:
Chemosphere
Year:
2002
Document type:
Article
Affiliation country: