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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Phototransformation of Amlodipine in Aqueous Solution: Toxicity of the Drug and Its Photoproduct on Aquatic Organisms
Marina DellaGreca,Maria Rosaria Iesce,Marina Isidori,Sara Montanaro,Lucio Previtera,Maria Rubino +5 more
TL;DR: The phototransformation of amlodipine in water was investigated under various conditions and the photoproduct exhibited a stronger toxic potential than the parent drug on the long time for C. dubia.
Journal ArticleDOI
Environmental photoinactivation of extracellular phosphatases and the effects of dissolved organic matter.
TL;DR: In this article, the photochemical stability of phosphatase and effects of natural organic matter (DOM) are not completely understood, but it is shown that photoinactivation can be significantly slowed in the presence of naturally occurring antioxidants like DOM.
Journal ArticleDOI
The effects and the toxicity increases caused by bicarbonate, chloride, and other water components during the UV/TiO2 degradation of oxazaphosphorine drugs
TL;DR: Toxicity tests showed that higher toxicity occurred in the presence of HCO3− or Cl− during UV/TiO2 treatment and within 6 h of reaction time, implying that the effects of these two anions should not be ignored when photocatalytic treatment is applied to treat real wastewater.
Journal ArticleDOI
Effect of UV irradiation on the proportion of organic chloramines in total chlorine in subsequent chlorination
TL;DR: It was found that the UV pretreatment could enhance the percentage of organic chloramines by increasing free chlorine consumption in the chlorination of raw waters and the decomposition of aromatic organic matter by UV could be a contributor to the increase offree chlorine consumption and organic chloramine proportion.
Journal ArticleDOI
Pesticide behavior in modified water-sediment systems.
TL;DR: No consideration of environmental factors such as sunlight and aquatic macrophytes is included in the standardized laboratory water-sediment study in darkness, and this may lead to a conservative assessment of pesticide behavior.
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