Micromeritics ASAP 2460 Operator's Manual page 363

ASAP 2460 Operator's Manual
For each point designated for Dubinin-Astakhov calculations, the following calculations are done:
 
LV = log
LP = log
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 Yes 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
used. The following are calculated:
a.) Slope (S cm
b.) Y-intercept (YI cm
c.) Error of the slope (S
d.) Error of the y-intercept (YI
e.) Correlation coefficient
f.) Optimized Astakhov exponent (N)
Using the results of the above calculations, the following can be calculated:
Monolayer Capacity (cm
YI
Q = 10
0
Micropore Volume (cm
Q V
i mol
---------------- -
V =
i
22414
where
V =
mol
246-42800-01 - Aug 2013
Q
N
Po
------ -
P
-4
. If the optimum value for N is not found in this range, an exponent of 2 is
3
/g STP)
3
/g STP)
3
cm /g STP)
err
3
cm /g STP)
err
3
/g STP):
3
/g):
liquid molar volume conversion factor from the fluid property information 
Appendix C
C-39