Registration Dossier
Registration Dossier
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EC number: 215-181-3 | CAS number: 1310-58-3
Additional information on environmental fate and behaviour
Administrative data
- Endpoint:
- additional information on environmental fate and behaviour
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Original data are not available.
Data source
Reference
- Reference Type:
- publication
- Title:
- Estimation of the Half-Life of Sodium Hydroxide Aerosol in the Atmosphere.
- Author:
- US EPA
- Year:
- 1 988
- Bibliographic source:
- Memorandum from Dave Guinnup and Richard Scheffe to Timothy Mohin. Office of Air Quality Planning and Standards, Research Triangle Park, North Carolina. May 5, 1988
Materials and methods
- Principles of method if other than guideline:
- No data
- GLP compliance:
- not specified
Test material
- Reference substance name:
- Sodium hydroxide
- EC Number:
- 215-185-5
- EC Name:
- Sodium hydroxide
- Cas Number:
- 1310-73-2
- Molecular formula:
- HNaO
- IUPAC Name:
- sodium hydroxide
Constituent 1
Results and discussion
Any other information on results incl. tables
Sodium hydroxide is very short lived in the atmosphere. Sodium hydroxide released to the atmosphere as an aerosol in solution with water will be neutralized as a result of its reaction with carbon dioxide (US EPA, 1989)*. The principal reaction products are sodium carbonate and water. The atmospheric half life of sodium hydroxide has been estimated at 13 seconds. Based on model calculations, this degradation results in only 0.4% of the NaOH emitted to air remaining in the air at a point 200 metres from the emission point.
*: US EPA (1989): Assessment of sodium hydroxide as a potentially toxic air pollutant. Federal Register, 54, No.9, January 1989. United States Environmental Protection Agency, United States.
Applicant's summary and conclusion
- Conclusions:
- As the hydroxyl ion is the neutralized species, the same reaction will occur with the hydroxyl ion of potassium hydroxide. The formed carbonate salts will be washed out by rain.
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