Environmental Engineering Reference
In-Depth Information
Photolysis was faster under simulated irradiation (Xe lamp, 1.1 KW) than
under natural sunlight, producing first-order rate constants of 0.0817 and
0.0163 h
-1
for distilled water, 0.0518 and 0.0132 h
-1
for sea water, 0.0394 and
0.0117 h
-1
for river water, and 0.0335 and 0.0084 h
-1
for lake water. This
observation seems normal when considering that sunlight intensity varies
depending on the time of day and on cloud cover, while the suntest appara-
tus keeps the intensity constant. Experiments conducted by Sakkas et al. [35]
under the presence of various concentrations of DOM (HA and FA), also
produced first-order degradation curves, allowing for the calculation of the
dichlofluanid photolysis rate constants. In all cases the presence of DOM
Fig. 3
Photolytic degradation pathways and main phototransformation products of
dichlofluanid in aqueous environment [34, 35]
