Micromeritics ASAP 2460 - Quantity Adsorbed Calculations

ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-3
Quantity Adsorbed Calculations
For the i
th
dose, the quantity dosed is
The pressure, volume, and temperature are those of the dosing manifold before and after expanding
into the sample tube.
The quantity of gas in the free space is
with the real gas equation of state. Here, P
s
is the sample pressure.
where:
T
amb
= approximate room temperature (298 K)
T
bath
= analysis bath temperature (K)
V
fc
= volume of free space, cold (cm
3
at standard temperature)
V
fw
= volume of free space, warm (cm
3
at standard temperature)
The specific quantity adsorbed is
where m is the sample mass.
n
dosed i
n
dosed i 1–
nP
1
V
m
T
1
nP
2
V
m
T
2
–+=
n
ads i
n
dosed i
n
fs i
–=
n
fs i
P
si
T
STD
------------
V
fc
zP
s i
T
bath

-------------------------------
V
fw
zP
si
T
amb

-------------------------------
+


=
Q
ads i
n
ads i
m
-------------
=