Nitrite facilitated transformation of halophenols in ice
Jie Chen1, Peizeng Yang1, Jing Chen1
1Department of Environmental Science and Engineering, Nanjing Agricultural University, Nanjing, 210095, China.
Freezing ice accelerates halophenol transformation via nitrite, forming nitrated products and hydroxyl polyhalogenated diphenyl ethers (OH-PBDEs). Natural organic matter inhibits these ice-based reactions.
Area of Science:
- Environmental Chemistry
- Chemical Oceanography
- Atmospheric Chemistry
Background:
- Halophenols are common environmental contaminants.
- Transformation of halophenols in cold environments is not well understood.
- Nitrite is a ubiquitous environmental species.
Purpose of the Study:
- Investigate the transformation of halophenols in ice.
- Elucidate the role of nitrite in ice-phase reactions.
- Identify transformation products and pathways.
Main Methods:
- Experiments conducted under slightly acidic conditions in ice.
- Comparison with reactions in liquid water at 4 °C.
- Analysis of nitrated products and coupling products using analytical techniques.
Main Results:
- Rapid transformation of halophenols in ice, negligible in liquid water.
- Formation of nitrated halophenols and hydroxyl polyhalogenated diphenyl ethers (OH-PBDEs) via nitration and oxidative coupling.
- Freeze-concentration effect enhances reactivity by concentrating reactants and lowering pH.
- Natural organic matter inhibits these ice-phase reactions.
Conclusions:
- Ice provides a unique micro-environment for halophenol transformation.
- Nitrous acid and nitrosonium ions generated in ice facilitate nitration and oxidation.
- Potential formation pathways for nitrophenolic compounds and OH-PBDEs in cold environments.
- Findings open new avenues in environmental chemistry research.
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