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Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Description of key information

The dissociation constant (pKa) of DEIPA was determined to be 8.24 at a sample concentration of 0.01 M and at 20oC (Butler, 2012). 

Key value for chemical safety assessment

pKa at 20°C:
8.24

Additional information

By using the titration method, equivalent to OECD test guideline 112 and in compliance with GLP, the dissociation constant (pKa) of DEIPA was determined to be 8.24 at a sample concentration of 0.01 M and at 20oC (Butler, 2012).

NICNAS (2009) noted that DEIPA "will be ionised in the environmental pH range of 4-9" (based on an estimated pka of 8.43).

References

NICNAS (2009). Australian National Industrial Chemicals Notification and Assessment Scheme. Full Public Report. DEIPA. File No: STD/1344. December 2009.http://www.nicnas.gov.au/publications/CAR/new/Std/StdFULLR/std1000FR/std1344FR.pdf