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International Journal of Photoenergy
Volume 2 (2000), Issue 1, Pages 55-57

Photostability and photostabilizing effect of humic acids

1Département de Chimie, Faculté des Sciences de Rabat, Av Ibn batouta, Rabat BP 1014, Morocco
2Laboratoire d'Application de la Chimie à l'Environnement (LACE)-UMR 5634-Photochimie, Université Claude Bernard-Lyon 1, 43 Boulevard du 11 Novembre 1918, Villeurbanne-Cedex, France

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The photolysis of Humic Acids (HA) extracted from Moroccan soil in water under simulated sunlight method has been studied. The photochemical degradation of HA in concentration (30 mg/L) has been followed by TOC (Total Organic Carbon) and E4/E6 ratio (The E4/E6 value widely used to characterize humic acids is the ratio of absorption intensities at 465 and 665 nm). HA were found photostable after 24 h of irradiation exposure and produce a screen effect on photochemical degradation of TRB (Tribenuron-methyl) and IMAZ (Imazapyr) herbicides.