Journal ArticleDOI
Nitrate-induced photooxidation of trace organic chemicals in water.
TLDR
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water.Abstract:
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water. The experiments were conducted under steady-state irradiations with monochromatic radiation (313 nm) and with sunlight. The mean quantum efficiency for OH production at 313 nm rises from 0.013 +/- 0.002 at 20 /sup 0/C to 0.017 +/- 0.003 at 30 /sup 0/C in the pH range 6.2-8.2. Results of this study are used to estimate nitrate-induced photooxidation rates of trace organic chemicals under a variety of environmental conditions. 27 references, 6 figures, 2 tables.read more
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Photo-degradation of clofibric acid by ultraviolet light irradiation at 185 nm.
TL;DR: Investigation of clofibric acid for its ultraviolet (UV) degradation at monochromatic wavelength of 185 nm using Milli-Q water and sewage treatment plant (STP) effluent showed that OH generated from waterphotolysis by UV185 irradiation was involved, resulting in indirect CA photolysis but contributed less to the whole CA removal when compared to the main direct photolytic process.
Journal ArticleDOI
The production of dissolved gaseous mercury from methylmercury photodegradation at different salinity
TL;DR: In this paper, the effect of various environmental factors (i.e., light wavelength and intensity, and MeHg concentration) on the abiotic photodegradation of methylmercury (MeHg) was examined.
Journal ArticleDOI
A Model to Predict the Steady‐State Concentration of Hydroxyl Radicals in the Surface Layer of Natural Waters
TL;DR: Based on the model results it is possible to predict the half-life time, due to reaction with *OH, of given dissolved compounds, including organic pollutants, from the water composition data.
Phototransformation pf selected pharmaceuticals during UV treatment of drinking water
TL;DR: The kinetics of Ultraviolet C-induced direct phototransformation of four representative pharmaceuticals, i.e., 17alpha-ethinylestradiol (EE2), diclofenac, sulfamethoxazole, and iopromide, was investigated in dilute solutions of pure water buffered at various pH values using a low-pressure and a medium-pressure mercury arc lamp.
Journal ArticleDOI
The modelling of Surface-Water photoreactions made easier: introducing the concept of 'equivalent monochromatic wavelengths'.
TL;DR: This work shows that the EMW approach, although approximated, entails a negligible loss in accuracy compared to the exact polychromatic treatment of photochemical reactions, thereby completely changing the way multi-wavelength problems are dealt with.
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