Transcription of Calculations and Occupational Exposure Limits
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Calculations and Occupational Exposure Limits
Calculations Evaluation Control1 Calculations and Occupational Exposure LimitsDr. Peter Bellin, PhD, CIHEOH 466 AThe Occupational Environment2 Definitions 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 Control23 OELs4 OELs 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 Control35 OELs Time-weighted average (TWA) Ceiling value (C) Short-Term Exposure Limit (STEL) Immediately Dangerous to Life and health (IDLH)6 OELs Exposure Limits for gases and vapors are established in terms of ppm mg/M3values are determined by calculation , conversion based upon an assumption of NTP If samples are taken at P and T conditions very different from NTP and results are in mg/M3, results must be Evaluation Control47 OELs Conversion between ppm and = =8 OELs Time weighted average concentration is measured by taking one or more measurements of concentration over a work shift.
Calculations Evaluation Control 3 5 OELs • Time-weighted average (TWA) • Ceiling value (C) • Short-Term Exposure Limit (STEL) • Immediately Dangerous to Life and Health
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