FTIR Fourier Transform Infrared FTIR Introduction Air monitoring

FTIR Introduction Air monitoring data is useful for: * Assessing the health risks to

FTIR Toxic atmosphere monitoring is done to: * identify airborne concentrations that could pose

Characteristics of Air Monitoring To be useful air monitoring instruments must be: * Portable

Reliable and Useful Results n The response time, sensitivity, selectivity, accuracy and precision of

FTIR Direct reading n Simultaneous monitoring of low level concentrations n Higher efficiency than

FTIR Michelson interferometer detector utilized to “observe” entire spectrum at same instant n Light

FTIR n Typically used in “extractive mode” as compared to open-path mode u Real-time

FTIR n Useful because u Able to monitor wide variety of compounds u Non-invasive

FTIR u u Calibration is “up in the air” but calibration cells are being

References Cited http: //www. ftir. cz/ Accessed 05/02/01 http: //www. nicoletindustrial. com/Antaris/Anta ris. html

Bibliography Di. Nardi Salvatore R. (1998) The Occupational Environment-Its Evaluation and Control, AIHA, Fairfax,

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FTIR Fourier Transform Infrared

FTIR 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.

FTIR 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. Colorimetric Indicator Tubes

Characteristics of Air Monitoring To be useful air monitoring instruments must be: * Portable and rugged. * Easy to operate. * Inherently safe. * Able to generate reliable and useful results.

Reliable and Useful Results n 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.

FTIR Direct reading n Simultaneous monitoring of low level concentrations n Higher efficiency than other IR methods n Qualitative n Quantitative n

FTIR Michelson interferometer detector utilized to “observe” entire spectrum at same instant n Light is split between two mirrors n Reflected light beam split is measured n Fourier transform is used to plot intensity versus wave number comparing moving and stationary mirrors n

FTIR n Typically used in “extractive mode” as compared to open-path mode u Real-time monitoring u Auto exhaust u Stack gases u Air pollution

FTIR n Useful because u Able to monitor wide variety of compounds u Non-invasive monitoring u Covers large areas

FTIR u u Calibration is “up in the air” but calibration cells are being developed. Discrepancy between clean air and monitored air can be troublesome in field scenarios

FTIR

References Cited http: //www. ftir. cz/ Accessed 05/02/01 http: //www. nicoletindustrial. com/Antaris/Anta ris. html Accessed 05/02/01 NIOSH Manual of Analytical Methods (NMAM®), 4 th ed. DHHS (NIOSH) Publication 94 -113 (August, 1994), Cassinelli, M. E. & O'Connor, P. F. (pfo 1@cdc. gov), Eds.

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