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Physical & Chemical properties

Dissociation constant

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Description of key information

DTPMP acid has ten ionisable groups.

Key value for chemical safety assessment

Additional information

Ten dissociation constant values as listed below are reported in secondary literature which is considered reliable. The result (Tomson 1994) is considered to be reliable and selected for key study.

1.03 
2.08 
3.11
4.15 
5.19 
6.23 
7.23 
8.30 
1.18 
12.58

Eight of the ten pKa values were determined in a second reliable study (Martell 1968) and are listed below. They are considered as supporting data.

pKa3 = 2.8
pKa4 = 4.45
pKa5 = 5.5
pKa6 = 6.38
pKa7 = 7.17
pKa8 = 8.15
pKa9 = 10.1
pKa10 = 12.04