BS 4359-1:1984
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Determination of the specific surface area of powders Recommendation for gas adsorption (BET) methods
Hardcopy , PDF
15-04-1996
English
31-01-1985
Foreword
Committees responsible
Methods
0 Introduction
1 Scope
2 Definitions
3 Symbols
4 Principle
5 Outgassing
6 Volumetric method
7 Continuous flow method
8 Gravimetric method
9 Reporting
Appendices
A Gas adsorption using gases other than nitrogen
B Single point determination
C Automatic constant level device for liquid nitrogen
D Detailed procedure for volumetric method
E Tabulated data and calculation using volumetric
method
F Precision of results
G Bibliography
Tables
1 Recording of data and calculation of results
2 Values of the molecular cross-sectional area for
various adsorptives
Figures
1 Surface reached by adsorption method
2 Surface reached by permeametry method
3 Part of adsorption isotherm showing experimental
points
4 BET plot corresponding to adsorption isotherm of
figure 3
5 Arrangement of apparatus for volumetric method
6 Sample bulbs of 10 cm3 volume
7 Gas burette
8 Plot of initial nitrogen pressure against total
surface area
9 Schematic diagram of apparatus for continuous flow
method
10 Chart recorder trace of adsorption, desorption,
calibration and change in gas concentration
11 Sample tubes
12 Chart recorder trace for sample of low surface area
13 Arrangement of spring balance in gravimetric method
14 Dewar bath
15 Constant level device for liquid nitrogen
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