Registration Dossier

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Study period:
02 February 2000 to 10 March 2000
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study conducted to appropriate OECD test guidance but is not GLP compliant.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2000
Report Date:
2000

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
Deviations:
no
GLP compliance:
no
Remarks:
The testing facility is accredited on the basis of DIN EN 45001

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Test substance: Reaktiv Blau FC 75311

Results and discussion

Dissociating properties:
yes
Dissociation constant
No.:
#1
pKa:
> 1.4 - < 5.8
Temp.:
22 °C
Remarks on result:
other: The dissociation constant of the test substance at room temperature (circa 22°C) was determined within the study as pKa between 1.4 and 5.8 for the acid range, using the six mean values of three experiments.

Any other information on results incl. tables

The dissociation constant of the test substance at room temperature (circa 22°C) was determined within this study as pKa between 1.4 and 5.8 for the acid range, using the six mean values of three experiments.

 The pKavalue for the alkaline range was not determined because it was not recognized as a real one. The investigations for the hydrolysis show the decomposition of the reactive-dyes in alkaline solutions.

 

 The quoted guideline demands pure or commercial grade substances for carrying out the described test methods. So it is not possible to calculate the possible effects of impurities on the overall results.

Applicant's summary and conclusion

Conclusions:
The substance dissociates in the presence of acid, and decomposes in the presence of alkali.
Executive summary:

The substance displayed a range of dissociation in the acid range; this is expected given the structural formula of the substance(s). Decomposition in the alkaline solutions was observed, however decomposition products were not assessed.