Registration Dossier
Registration Dossier
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EC number: 215-222-5 | CAS number: 1314-13-2
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Data waiving:
- other justification
- Justification for data waiving:
- other:
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
pH = 6.95 (American process zinc oxide); 7.37 (French process)
O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Cambridge, UK: Royal Society of Chemistry, 2013., p. 1888
Source: HSDB
Record Name: ZINC OXIDE
URL: http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@rn+@rel+1314-13-2
ZnO is pH neutral and does not contain any Hydrogen atom, dissociation constant is not relevant. Equilibrium of Zinc ion in water is illustrated by Pourbaix diagram on page 18 of the attached report (Outotec 2010 - 10043-ORC-T). No difference expected for the nano.
The surface treatment applied does not modify the properties of the substance.
This justification applies to both sets of nanos: the "Zinc oxide nano with and without hydrophilic surface treatment" set and the "Zinc oxide nano - hydrophobic surface treatment" set.
Reference
Description of key information
The dissociation constant relating to the acidity constant, pKa, as required by the IUCLID database and REACH Guidance document, is not relevant for the substance.
Key value for chemical safety assessment
Additional information
JUSTIFICATION FOR DATA WAIVING
pH = 6.95 (American process zinc oxide); 7.37 (French process)
O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Cambridge, UK: Royal Society of Chemistry, 2013., p. 1888
Source: HSDB
Record Name: ZINC OXIDE
URL: http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@rn+@rel+1314-13-2
ZnO is pH neutral and does not contain any Hydrogen atom, dissociation constant is not relevant. Equilibrium of Zinc ion in water is illustrated by Pourbaix diagram on page 18 of the attached report (Outotec 2010 - 10043-ORC-T). No difference expected for the nano.
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