Sorbent Media-Silica Gel

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Presentation transcript:

Sorbent Media-Silica Gel

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

Sorbent Media-Silica Gel Specific Surface Area 300-800 m2/g Upper Temperature Range N/A Composition Amorphous Silica

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

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

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

Sorbent Media-Silica Gel Filter Cassettes Filter Cassette Holder

References Cited SKC Inc. Corporate Web Page http://www.skcinc.com/ accessed 04/03/01

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

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