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Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23 September - 16 November 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
Deviations:
no
GLP compliance:
yes
Specific details on test material used for the study:
- Analytical purity: 94.55 %
- Expiration date: 31 December 2017
- Storage condition: at room temperature
Dissociating properties:
yes
pKa:
4.19
Temp.:
25 °C
Remarks on result:
other: mean value of two measurements

Two tests were performed, the mean test temperature was 20°C, and the pH meter automatically adjusts to 25°C. The mean pKa at 25°C was 4.19 (mean of 4.27 and 4.10) using the second derivative.

Conclusions:
The dissociation constant of the substance was determined to be 4.19 at 25°C.

Description of key information

In a GLP study (K1, Foster, 2016) according to the OECD guideline 112, the dissociation constant of the test substance is determined to be 4.19 at 25°C.

Key value for chemical safety assessment

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