Micromeritics TriStar II 3020 Operator's Manual page 323

TriStar II 3020
(not including D
The layer thickness change desorbed during this interval also is added to the radii corre-
sponding to the ends of the pressure intervals as follows:
=
Rc Rc
Jnew
for all except Rc
Steps a to c are repeated for each pressure interval.
After the above calculations have been performed, the diameters corresponding to the ends of
the intervals are calculated as follows:

= 2 Rc
Dp
J
for all Rc
J
The remaining calculations are based on DP
done for D
diameter specified by the operator on the BJH Adsorption Report Options dialog or the BJH
Desorption Report Options dialog.
(1.) Incremental Pore Volume (Vp
=
Vp
I
(2.) Cumulative Pore Volume (Vp
VP
CUM
(3.) Incremental Surface Area (SA
=
SA
I
(4.) Cumulative Surface Area (SA
SA
CUM
(5.) dV/dD pore volume (dV/dD
dV/dD
302-42828-01 - Dec 2012
)
avgK
Tw
+
Jold
.
K+1

J
including Rc .
K+1
values that fall between the Minimum BJH diameter and the Maximum BJH
avg(I)
2
D
16 2 2
avg
 Lp   ------------ -
10 /A
I
cm
2
I

  
= for J 1
Vp
J
1  
2 –
 LP   10   D 
m/cm
I avg
I


= for J 1
SA
J
10
I
VP
I
------------------------------- -
=
–
I
Dp Dp
+ 1
I I
, D , and LP
(I) avg(I)
3
, cm /g):
I
3
, cm /g):
CUM(1)
2
, m /g):
I
– 10
 10  
m/A
2
, m /g):
CUM(I)
3
, cm /g-A):
Appendix C
. These calculations are only
(I)
C-15