Bet Surface Area - Micromeritics ASAP 2460 Operator's Manual

Appendix C

BET Surface Area

For each point designated for surface area calculations, the BET
------------------------------------------ -
B =

1.0 P –
A least-squares fit is performed on the (P
and B is the dependent variable. The following are calculated:
a.) Slope (S g/cm
b.) Y-intercept (Y
c.) Error of the slope (S
d.) Error of the y-intercept (YI
e.) Correlation coefficient
Using the results of the above calculations, the following can be calculated
BET Surface Area (m
-------------------------------------------------------------------------------------------------
SA =
bet

22414
where
CSA =
BET C value:
S + Y
----------------- -
C =
Y
int
Quality of the Monolayer (cm
1
------------ -
Q =
m
CY
int
C-8
P
rel
N
ads 1 
rel
, B) designated pairs where P
rel
3
STP)
3
g/cm STP)
int
3
g/cm STP)
err
3
g/cm
err
2
/g):
 
CSA 6.023 10
 18
10
3

---------------------- -
STP 
cm

m
analysis gas molecular cross-sectional area (nm
Adsorptive Properties window
int
3
/g STP):
1
----------------- -
=
S + Y
int
2
transformation is calculated as:
where B is in units of g/cm
STP)
23

2

nm
 
 S + Y
int
2

ASAP 2460 Operator's Manual
3
STP.
is the independent variable
rel
2
), user-entered on the
246-42800-01 - Aug 2013