Registration Dossier
Registration Dossier
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EC number: 215-185-5 | CAS number: 1310-73-2
Monitoring data
Administrative data
- Endpoint:
- monitoring data
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- other: grey literature
Data source
Reference
- Reference Type:
- grey literature
- Title:
- No title available
- Author:
- United Nations Environment Programme
- Year:
- 1 995
- Bibliographic source:
- UNEP Environment library No 14, Nairobi, Kenya
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
NaOH is present in the environment as sodium and hydroxyl ions. Both sodium and hydroxyl ions have a wide natural occurrence. In a global water monitoring program (UNEP, 1995) pH and sodium concentrations were two of the parameters that were monitored in many lakes and rivers. The most important freshwater aquatic ecosystems of the world revealed average annual pH values between 6.5 and 8.3 but lower and higher values have been measured in other aquatic ecosystems. In aquatic ecosystems with dissolved organic acids a pH of less than 4.0 has been measured, while in waters with a high chlorophyll content the bicarbonate assimilation can result in pH values of higher than 9.0 at midday. The global mean pH value is 7.7. Within this range the bicarbonate ion is the most common carbonate species found in natural waters. In streams (100 km2) bicarbonate concentrations range from 0 to 350 mg/l, while in major rivers (> 100,000 km2) the concentration ranges from 10 to 170 mg/l. Sodium concentrations in lakes and rivers display strong variability and orginate from natural weathering of rock, from atmospheric transport of oceanic inputs and from a wide variety of anthropogenic sources. Sodium concentrations in European rivers range between 1.2 and 574 mg/l.
Applicant's summary and conclusion
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
