1. FID Gas Meter/Detector

2. Introduction Air monitoring data is useful for: *Assessing the health risks to the public and response workers. *Selecting personal protective equipment. *Delineating areas where protection is needed. *Determining actual or potential effects on the environment. *Selecting actions to mitigate the hazards safely and effectively.

3. FID Gas Meter/Detector To be useful air monitoring instruments must be: *Portable and rugged. *Easy to operate. *Easy to operate. *Inherently safe. *Inherently safe. *Able to generate reliable and useful results. *Able to generate reliable and useful results.

4. Toxic Atmosphere Monitors Toxic atmosphere monitoring is done to: *identify airborne concentrations that could pose a toxic risk to response workers and the public. *evaluate the need for and type of personal protective equipment. *set up work zones or areas where contaminants are or are not present.

5. FID Gas Meter/Detector The response time, sensitivity, selectivity, accuracy and precision of an instrument are important in evaluating the reliability and usefulness of the data the instrument generates. The response time, sensitivity, selectivity, accuracy and precision of an instrument are important in evaluating the reliability and usefulness of the data the instrument generates.

6. FID Gas Meter/Detector Limitations & Considerations Temperature Temperature Oxygen Levels Oxygen Levels Interfering Coumpounds Interfering Coumpounds  Organic Lead  Sulfur compounds  Silicone  Acid Gases

7. FID Gas Meter/Detector One of the most widely used Generally applicable detectors Easy to use but destructive of the sample.

8. FIDs consist of a hydrogen/air flame and a collector plate effluent from column is mixed with hydrogen and air and then ignited electricallyeffluent from column is mixed with hydrogen and air and then ignited electrically most organic compounds produce ions and electrons that can conduct electricity through the flamemost organic compounds produce ions and electrons that can conduct electricity through the flame electrode above the flame collects the ionselectrode above the flame collects the ions number of ions hitting the collector is measured and a signal is generatednumber of ions hitting the collector is measured and a signal is generated FID Gas Meter/Detector

9. organic molecules undergo a series of reactions including thermal fragmentation, chemi-ionization, ion molecule and free radical reactions to produce charged-species organic molecules undergo a series of reactions including thermal fragmentation, chemi-ionization, ion molecule and free radical reactions to produce charged-species amount of ions produced is roughly proportional to the number of reduced carbon atoms present in the flame and hence the number of molecules amount of ions produced is roughly proportional to the number of reduced carbon atoms present in the flame and hence the number of molecules because the flame ionization detector responds to the number of carbon atoms entering the detector per unit of time, it is a mass-sensitive, rather than a concentration-sensitive device because the flame ionization detector responds to the number of carbon atoms entering the detector per unit of time, it is a mass-sensitive, rather than a concentration-sensitive device this detector has the advantage that changes in flow rate of the mobile phase has little effects on detector response this detector has the advantage that changes in flow rate of the mobile phase has little effects on detector response FID Gas Meter/Detector

10. carbonyl, alcohol, halogen, and amine, yield fewer ions or none at all in a flame carbonyl, alcohol, halogen, and amine, yield fewer ions or none at all in a flame detector is insensitive toward noncombustible gases detector is insensitive toward noncombustible gases FID Gas Meter/Detector

12. http://www.enviro- equipment.com/products/fox_tva1000.html http://members.kr.inter.net/guesu/gs/e_detecti on/flame-ionization-detector.htmlhttp://members.kr.inter.net/guesu/gs/e_detecti on/flame-ionization-detector.html Accessed 05/01/01 http://members.kr.inter.net/guesu/gs/e_detecti on/flame-ionization-detector.html NIOSH Manual of Analytical Methods (NMAM®), 4th ed. DHHS (NIOSH) Publication 94-113 (August, 1994), Cassinelli, M.E. & O'Connor, P.F. (pfo1@cdc.gov), Eds. O'Connor, P.F. (pfo1@cdc.gov)O'Connor, P.F. (pfo1@cdc.gov) References Cited

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