Chemical Thermodynamics of Tin - Volume 12 - OECD Nuclear ...

B.1 2BThe specific ion interaction equations
443
B.1.2 Ionic strength corrections at temperatures other than 25 °C
(298.15 K)
Values of the Debye-Hückel parameter A in Eqs. (B.2), (B.2a) and (B.12) are listed in
Table B-2 for several temperatures at a pressure of 1 bar below 100 °C and at the steam
saturated pressure for t ≥ 100 °C. The values in Table B-2 can be calculated from the
static dielectric constant and the density of water as a function of temperature and
pressure, as discussed in various references [1974HEL/KIR], [1979BRA/PIT],
[1981HEL/KIR], [1984ANA/ATK], [1990ARC/WAN], [2009PAT/HRU]. The values
in Table B-2 are those from Helgeson et al. [1981HEL/KIR]. More recent expressions
for the density and dielectric constant (e.g., those of Archer and Wang
[1990ARC/WAN] or Pátek et al. [2009PAT/HRU]) would generate very slightly
different values, but the Table B-2 values should be used to provide consistent TDB
activity coefficient expressions.
Table B-2: Values of the Debye-Hückel constant A as a function of temperature at a
pressure of 1 bar below 100 °C and at the steam saturated pressure for t ≥ 100 °C. The
uncertainty in the A parameter is estimated by this review to be ± 0.001 kg ½·mol –½ at
25 °C, and ± 0.006 kg ½·mol –½ at 300 °C.
t / °C p / bar A/ kg ·mol −
1 1
2 2
0 1.00 0.491
5 1.00 0.494
10 1.00 0.498
15 1.00 0.501
20 1.00 0.505
25 1.00 0.509
30 1.00 0.514
35 1.00 0.518
40 1.00 0.523
50 1.00 0.534
75 1.00 0.564
100 1.013 0.600
125 2.32 0.642
150 4.76 0.690
175 8.92 0.745
200 15.5 0.810
250 39.7 0.979
300 85.8 1.256
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012