Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 291-367-8 | CAS number: 90387-90-9
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
The dissociation constant is important since the fate (e.g. water solubility, adsorption and bioconcentration potential) and toxicity of the ionised form of a substance may be markedly different from the corresponding neutral molecule.
Graphite, acid-treated is an inorganic solid, consisting of natural graphite and variable amounts of either intercalated nitric acid or acetic acid. The main component – graphite - is a naturally occurring inorganic solid substance which is insoluble in water. Due to a lack of relevant functional groups which might be susceptible to different pH values it can be argued that no dissociation occurs. The intercalated acid (nitric or acetic acid) and the intercalated ions (nitrite/nitrate, acetate) are partially leached out by water. The intercalated acids dissociate into the environmentally ubiquitous nitrate, acetate und hydronium ions.
According to the entries for acetic acid and nitric acid in the Hazardous Substance Data Bank the pKa constants were determined at 4.76 and -1.38, respectively.
Neither the graphite, nor the intercalated acids and ions exhibit bioaccumulative behaviour. Therefore, the determination of the dissociation constant, which might be important with regard the aforementioned properties, can be considered as not relevant for this substance.
Key value for chemical safety assessment
Additional information
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.
