Interactions between Halide Ions and Ammonia in Water under UV Light from Low Pressure Mercury Lamps
Publication: World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns
Abstract
The impact of low pressure UV lamps on the oxidation of ammonia (NH3) in the presence of individual halide ions (bromide (Br–), chloride (Cl–) and iodide (I–) was investigated and revealed that the ions have the potential to accelerate ammonia photo-oxidation. The process was found to be dependent on solution pH, the type of halide ion and the concentrations of halide ion and aqueous ammonia. Protons are released during the reaction while the halide ion concentrations remain unchanged. Nitrite (NO2–) and nitrate (NO3–) are produced as final stable nitrogen species, with the yield being dependent on the initial pH of the irradiated solution. NH3 oxidation occurred with Br– and Cl– at all pH levels, but in the presence of I– it proceeded only at basic pH. Sulfur hexafluoride (SF6) was used as an electron (e–) scavenger to demonstrate that ammonia oxidation generates e– in solutions containing halide ions. The process was confirmed with the formation of fluoride (F–) and sulfate (SO42–) ions.
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© 2006 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- [Inorganic compounds]
- Ammonia
- Architectural engineering
- Building systems
- Chemical compounds
- Chemical elements
- Chemical processes
- Chemical properties
- Chemicals
- Chemistry
- Continuum mechanics
- Dynamic pressure
- Dynamics (solid mechanics)
- Engineering mechanics
- Environmental engineering
- Heavy metals
- Light (artificial)
- Mercury (chemical)
- Organic compounds
- Oxidation
- pH
- Pressure (type)
- Radiation
- Solid mechanics
- Ultraviolet radiation
- Water pressure
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