ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-39
For each point designated for Dubinin-Astakhov calculations, the following calculations are done:
A least-squares fit is performed on the (LP,LV) designated pairs where LP is the independent variable
and LV is the dependent variable. If the user selected Ye s for the Optimize Astakhov Exponent
prompt, a systematic search for the optimum value of N is conducted by recalculating the linear regres-
sion and selecting the value of N that gives the smallest standard error of the y-intercept. The exponent
N is optimized to within 10
-4
. If the optimum value for N is not found in this range, an exponent of 2 is
used. The following are calculated:
a.) Slope (S cm
3
/g STP)
b.) Y-intercept (YI cm
3
/g STP)
c.) Error of the slope (S
err
cm
3
/g STP)
d.) Error of the y-intercept (YI
err
cm
3
/g STP)
e.) Correlation coefficient
f.) Optimized Astakhov exponent (N)
Using the results of the above calculations, the following can be calculated:
Monolayer Capacity (cm
3
/g STP):
Micropore Volume (cm
3
/g):
where
V
mol
= liquid molar volume conversion factor from the fluid property information
V
i
Q
i
V
mol
22414
-----------------
=
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