Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Currently viewing:

Administrative data

Endpoint:
dissociation constant
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: authoritative document

Data source

Reference
Reference Type:
secondary source
Title:
SIDS Initial Assessment Report for 9th SIAM
Author:
OECD
Year:
1999
Bibliographic source:
Paris, 29 June - ist July 1999

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: no data
Principles of method if other than guideline:
other: calculated
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Barium bis[2-chloro-5-[(2-hydroxy-1-naphthyl)azo]toluene-4-sulphonate]
EC Number:
225-935-3
EC Name:
Barium bis[2-chloro-5-[(2-hydroxy-1-naphthyl)azo]toluene-4-sulphonate]
Cas Number:
5160-02-1
Molecular formula:
C17H13ClN2O4S.1/2Ba
IUPAC Name:
barium(2+) bis(5-chloro-2-[(1E)-2-(2-hydroxynaphthalen-1-yl)diazen-1-yl]-4-methylbenzene-1-sulfonate)
Test material form:
solid: nanoform
Details on test material:
Test materials used in this dossier are all considered to fall under the definition of nano-materials according to the European Commission Recommendation 2011/696/EU as the synthesis and manufacturing of this pigment always yields particulate material with a fine particle size distribution.

Results and discussion

Dissociating properties:
yes
Dissociation constantopen allclose all
No.:
#1
pKa:
-5.49
Temp.:
20 °C
Remarks on result:
other: sulfonate group
No.:
#2
pKa:
8.96
Temp.:
20 °C
Remarks on result:
other: phenolic group

Applicant's summary and conclusion