# Health and Safety

Submitted By CJacobs123
Words 420
Pages 2
The TLV for carbon monoxide is 25ppm according to the Ministry of Labour for Ontario. Define the terms TLV and ppm and calculate them for the following example:
A mechanic in an automotive repair shop is exposed to the following carbon monoxide levels over an 8 hour shift.
1. 2 hours @ 34 ppm
2. 5 hours @ 40 ppm
3. 1 hour @ 20 ppm
Is the worker over-exposed during the duration of the work-shift? What is the primary concept of hazard recognition and the hierarchy of hazard control?
Going through this list – explain how they might be applied to this example to provide potential solutions.
Answer- The threshold limit value (TLV) is the maximum concentration of a chemical allowable for repeated exposure without producing adverse health effects. The TLV chemical substances is defined as a concentration in air, typically for inhalation or skin exposure. Its units are in parts per million (ppm) for gases and in milligrams per cubic meter (mg/m3) for particulates such as dust, smoke and mist.
PPM- Parts Per million: This is a way of expressing much diluted concentrations of substances. Just as a percentage is generally is out of 100, parts per million or PPM means out of million. PPM usually describes the concentration of something in water or soil. One PPM is equivalent to 1 milligram something per liter of water or (mg/l) or one milligram of something per kilogram soil (mg/kg).
TLV in mg/m3 = (TLV in ppm) (gram molecular weight)/24.45
*24.45 is the molar volume of air in liters
Gram molecular weight of CO=28.0101 g/mol
PPM = x(%) = x(ppm)/10000
*2 hours @34ppm
TLV in mg/m3=38.95mg/m3
PPM = 0.0034%
*5hours @40ppm
TLV in mg/m3=45.82 mg/m3
PPM=0.0040%
*1hour @ 20ppm
TLV in mg/m3 = 22.91 mg/m3
PPM = 00020%
Yes the worker is over-exposed during the duration of their 8 hour shift. The primary goal of hazard recognition is to reduce incidents, accidents,...

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