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Air monitoring is important to assess workplace chemical concentrations. Information collected from air monitoring helps occupational health and safety professionals, called industrial hygienists, to determine whether there is potential for worker overexposure and to take preventative measures. A variety of chemical sampling and analysis techniques are used to monitor chemical concentrations in the air.

MDI and TDI generally react quickly with compounds that contain an active hydrogen group or groups. Therefore, to allow for meaningful workplace measurements, methods used for monitoring airborne concentrations must be capable of trapping and derivatizing the diisocyanate(s) to a stable derivative(s) in the field.

Resources List

Some resources available to help with diisocyanates air monitoring include:

  • Occupational Hygiene Air Monitoring for MDI and TDI Guidance
    This guidance document describes workplace air monitoring methods for MDI and TDI, and provides information on personal and area sample collection. Several instruments and derivatization methods for monitoring vapors are presented. (AX248, 2012)
  • MDI Emissions Estimator*
    This software provides a fast and convenient method to estimate MDI emissions from typical process applications and activities.
  • TDI Emissions Estimator*
    This software provides a fast and convenient method to estimate TDI emissions from typical process applications and activities.
  • OSHA Analytical Methods
    An index of sampling and analytical methods for chemicals that have either a validated or partially validated OSHA method.
  • NIOSH Analytical Methods
    See NIOSH Analytical Methods and Sampling on this Website.

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