Registration Dossier
Registration Dossier
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EC number: 293-927-7 | CAS number: 91648-65-6
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
Dissociation constant (OECD 112): 5.8 at 22 °C (mean of 7 determinations)
Key value for chemical safety assessment
- pKa at 20°C:
- 5.8
Additional information
The key value was determined according to OECD Guideline 112 (Rocchio, 1990). The UV/Vis absorption spectrum at 300 nm is obtained from solutions of constant concentration under a pH condition where the substance is essentially unionized and fully ionized and at several intermediate pHs. From the pH and absorbance values at the chosen wavelength, seven values for the pKa are calculated using data from at least 5 pHs where the compound is at least 10 % and less than 90 % ionized.
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