1. Sorbent Media-Silica Gel

2. Sorbent Media-Silica Gel
Definition
In line collection point for desired contaminant
Purpose
Collection of particulate matter
Serves as “capture” point of sampling train for later analysis

3. Sorbent Media-Silica Gel
Specific Surface Area
m2/g
Upper Temperature Range
N/A
Composition
Amorphous Silica

4. Sorbent Media-Silica Gel
Useful for
Polar compounds
Times when charcoal is unsuitable due to desorbing process
Disadvantages
Moisture absorption hampers collection
OSHA/NIOSH methods for aliphatic and aromatics, inorganic acids

5. Sorbent Media-Silica Gel
Method of Operation
Sample is collected or “absorbed”
Solvent is desorbed with appropriate solvent
Solute is then analyzed to determine elements and concentrations present

6. Sorbent Media-Silica Gel
Calibration
Rotameter
Flow is calibrated against ball “floating” in air in the chamber
Bubble tube(Manual or Electronic)
Flow is calibrated by timing bubble travel speed in vertical column

7. Sorbent Media-Silica Gel
Filter Cassettes
Filter Cassette Holder

8. References Cited SKC Inc. Corporate Web Page
accessed 04/03/01

9. Bibliography
DiNardi Salvatore R. (1998) The Occupational Environment-Its Evaluation and Control, AIHA, Fairfax, Virginia
Goetsch David L. (1999) Occupational Safety and Health for Technologists, Engineers, and Managers, Prentice Hall, Upper Saddle River, New Jersey