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Sorbent Media-Charcoal

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Title: Sorbent Media-Charcoal


1
Sorbent Media-Charcoal
2
Sorbent Media-Charcoal
  • 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-Charcoal
  • Specific Surface Area
  • gt1000 m2/g
  • Upper Temperature Range
  • N/A
  • Composition
  • Coconut shell or petroleum-based charcoal

4
Sorbent Media-Charcoal
  • Most widely used sorbent
  • OSHA/NIOSH methods based on charcoal
  • Variety of sources
  • Coconut shells, coal, wood, peat, petroleum
  • Coconut shell and petroleum are most common

5
Sorbent Media-Charcoal
  • High adsorptive capacity
  • Micropourous structure
  • High surface area-to-weight ratio
  • Ideal for sampling wide range of concentrations
    due to adsorptive capacity
  • High humidity can adversely effect
  • Use larger quantity of sorbent to overcome

6
Sorbent Media-Charcoal
  • Limitations
  • Inefficient for very volatile low molecular
    weight HCs
  • Inefficient for low BP compounds
  • Unsuitable for reactive collection

7
Sorbent Media-Charcoal
  • Method of Operation
  • Sample is collected or absorbed
  • Solvent is desorbed with appropriate solvent
  • Solute is then analyzed to determine elements and
    concentrations present

8
Sorbent Media-Charcoal
  • 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

9
Sorbent Media-Charcoal
  • Filter Cassettes
  • Filter Cassette Holder

10
References Cited
  • SKC Inc. Corporate Web Page
  • http//www.skcinc.com/ accessed 04/03/01

11
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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