Registration Dossier

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Two pKa values were determinated on DPTU :
pKa1 = 11.603 at 20.8 +/- 0.4 °C
pKa2 = 11.950 at 20.8 +/- 0.4 °C

Key value for chemical safety assessment

pKa at 20°C:
11.77

Additional information

The Dissociation Constants in Water (Spectrophotometric Method) of the test item N,N’-Diphenyl thiourea (DPTU) was studied according to the OECD guideline 112. Measurements were performed at a temperature of 20.8 +/- 0.4 °C.

Two pKa values were determinated :

pKa1 = 11.603 at 20.8 +/- 0.4 °C

pKa2 = 11.950 at 20.8 +/- 0.4 °C