Quantity Adsorbed Calculations - Micromeritics ASAP 2460 Operator's Manual

ASAP 2460 Operator's Manual

Quantity Adsorbed Calculations

th
For the i dose, the quantity dosed is
n =
dosed i 
The pressure, volume, and temperature are those of the dosing manifold before and after expanding
into the sample tube.
n = n
ads i 
The quantity of gas in the free space is
P
s i 
----------- -
n =
fs i 
T
STD
with the real gas equation of state. Here, P
where:
T =
amb
T =
bath
V =
fc
V =
fw
The specific quantity adsorbed is
n
------------ -
Q =
ads i 
where m is the sample mass.
246-42800-01 - Aug 2013
 
n + n P V

dosed i 1 – 1 m
– n
dosed i  fs i 
V

fc
------------------------------- ------------------------------ -
+

   
z P T z P
s i 
bath
is the sample pressure.
s
approximate room temperature (298 K)
analysis bath temperature (K)
volume of free space, cold (cm
volume of free space, warm (cm
ads i 
m
  n P    
T – V T
1 2 m 2
V

fw

 
T
s i 
amb
3
at standard temperature)
3
at standard temperature)
Appendix C
C-3