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Registration Dossier
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EC number: 284-895-5 | CAS number: 84989-06-0 The fraction of tar acids, rich in 2,4- and 2,5-dimethylphenol, recovered by distillation of low-temperature coal tar crude tar acids.
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Remarks:
- Data reported in the Hazardous Substances Data Bank. The test material is not identical to registration substance, but is a constituent of the registration substance.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Data reported in the Hazardous Substances Data Bank
- GLP compliance:
- no
- Specific details on test material used for the study:
- The registration substance is a mixture (UVCB). Different components of a mixture may have different pKa values. Therefore the data is given for constituent of the registration substance:
2,4-xylenol - Dissociating properties:
- yes
- No.:
- #1
- pKa:
- 10.6
- Temp.:
- 25 °C
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Remarks:
- Data reported in Hazardous Substances Data Bank. The test material is not identical to registration substance, but is a constituent of the registration substance.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Data reported in Hazardous Substances Data Bank
- GLP compliance:
- no
- Specific details on test material used for the study:
- The registration substance is a mixture (UVCB). Different components of a mixture may have different pKa values. Therefore the data is given for constituent of the registration substance:
3,5-xylenol - Dissociating properties:
- yes
- No.:
- #1
- pKa:
- 10.19
- Temp.:
- 25 °C
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Remarks:
- Data reported on the Hazardous Substances Data Bank. The test material is not identical to registration substance, but is a constituent of the registration substance.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Data published in the Hazardous Substances Data Bank
- GLP compliance:
- no
- Specific details on test material used for the study:
- The registration substance is a mixture (UVCB). Different components of a mixture may have different pKa values. Therefore the data is given for constituent of the registration substance:
2,5-xylenol - Dissociating properties:
- yes
- No.:
- #1
- pKa:
- 10.41
- Temp.:
- 25 °C
- No.:
- #1
- pKa:
- 10.3
- Remarks on result:
- other: temperature not reported
Referenceopen allclose all
Temperature is not reported in the Blackman Article
Description of key information
pKa: 10.2 - 10.6 at 25 °C
Values of individual constituents:
2,4-xylenol: 10.6 at 25 °C
2,5-xylenol: 10.4 at 25 °C
3,5-xylenol: 10.2 at 25 °C
Key value for chemical safety assessment
Additional information
The reported values for the dissociation constants of the main constituents of Tar acids, xylenol fraction range from pKa values of 10.19 -10.6
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