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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Description of key information

In accordance with REACH Annex IX column 2, the study does not need to be conducted if it is scientifically not possible to perform the test for instance if the analytical method is not sensitive enough. Since the substance is a complex UVCB of various constituents (mainly metals and metallic oxides) the determination of the dissociation constant is technically not possible because there is no suitable analytical method available for performing the test. Likewise it is impossible to determine the pKa values of the single constituents in the UVCB by any mathematical calculation.
According to ECHA Guidance on information requirements and chemical safety assessment R.7.1.17, the dissociation constant in water is important for ionisable organic substances only, while our substance is inorganic.
See also attachment "Waiving statement_diss-const_CAS 69012-29-9_28102010.pdf"

Key value for chemical safety assessment

Additional information

In accordance with REACH Annex IX column 2, the study does not need to be conducted if it is scientifically not possible to perform the test for instance if the analytical method is not sensitive enough. Since the substance is a complex UVCB of various constituents (mainly metals and metallic oxides) the determination of the dissociation constant is technically not possible because there is no suitable analytical method available for performing the test. Likewise it is impossible to determine the pKa values of the single constituents in the UVCB by any mathematical calculation. According to ECHA Guidance on information requirements and chemical safety assessment R.7.1.17, the dissociation constant in water is important for ionisable organic substances only, while our substance is inorganic.