Calculations and Occupational Exposure Limits

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Calculations Evaluation Control1Calculations and Occupational Exposure LimitsDr. Peter Bellin, PhD, CIHEOH 466AThe Occupational Environment2Definitions Vapors Gases Aerosols Particulates: dust, fume, fibers, nanoparticles, smoke Mist Particle size considerations Inspirable Particulate Mass (IPM) Thoracic Particulate Mass (TPM) Respiratory Particulate Mass (RPM) Calculations Evaluation Control23OELs4OELs Concentration Parts per million Maximum vapor concentration = VPl/ VPatmx 106 Milligrams per cubic meter Normal temperature and pressure 760 mm Hg and 25 C Molar volume = Liters per moleCalculations Evaluation Control35OELs Time-weighted average (TWA) Ceiling value (C) Short-Term Exposure Limit (STEL) Immediately Dangerous to Life and Health (IDLH)

Calculations Evaluation Control 6 11 OELs • Sample TWA calculation ppm hrs ppm hrs hrTWA ppm hrs ppm hrs hrs hrs hrs ppm hrs ppm hrs ppm hrs 205 8 1640 8 234

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