256
C. De Stefano . C. Foti . A. Gianguzza . D. Piazzese . S. Sammartano
Table A9.2. Apparent protonation constants' of tri, tetra
5
H*
10gK,
H*
logf3 2
H*
logf3 3
H*
log f34
H*
10gf3 s
and hexacarboxylic ligands in
artificial sea water, at t = 25°C
tca
5
5.81
10.42
14.07
15
5.60
10.08
13.65
25
5.51
9.93
13.45
35
5.45
9.84
13.31
45
5.41
9.77
13.21
mtca
5
6.86
11.64
15.01
15
6.59
11.21
14.51
25
6.46
11.00
14.24
35
6.37
10.87
14.06
45
6.30
10.78
13.93
cit
15
4.31
8.28
11.10
25
4.24
8.12
10.94
35
4.18
8.00
10.79
45
4.15
7.91
10.63
btc
5
5.74
10.74
14.81
18.03
15
5.56
10.36
14.34
17.47
25
5.55
10.31
14.23
17.35
35
5.57
10.28
14.20
17.30
45
5.56
10.31
14.18
17.28
mit
5
5.03
9.50
13.10
15.79
16.6
15
4.89
9.17
12.70
15.35
15.8
25
4.89
9.10
12.66
15.33
15.6
35
4.92
9.08
12.68
15.39
15.5
45
4.96
9.07
12.72
15.46
15.5
a fJH
z+
j-z
j refer to the reaction: L + jH ~ HjL .