Air samples show the following contaminant concentrations in an 8-hour shift (fr

Question

Air samples show the following contaminant concentrations in an 8-hour shift (from 8:00 A.M. to 4:00 P.M.): 1. Trifluorobromomethane, 0.1% from 11:00 A.M. to 2:00 P.M. 2. Propane, 0.05% all day 3. Phosgene, 1 part per million at 2:00 P.M., with a duration of 15 minutes (a) Assuming that no other contaminants are present, does the full-shift atmosphere meet OSHA standards? (b) To exactly meet OSHA standards, how much more or less time for the phosgene exposure would be permissible provided other contaminants remain as previously stated?

Explanation / Answer

exposure limit of trifluorobromometahe 0.5 ppm (bromoform) (5mg/m3)

propane =1000 ppm (1800 gm/m3)

phosgene = 0.1 ppm (0.4 mg/m3)

from the given data trifluorobromomethane 0.1%= 0.1 gram= 100 mg (exceedded >5mg)

propane = 0.05%= 0.05grams = 50 mg ( did not exceeded the permissible limit)

phosgene= 1ppm ( exceeded the limit>0.1)

hence all the exposure quatities of air pollutants are not safe for industrial working.Phosgene and trifluorobromomethene have exceeded the permissible limits and causes health hazards.

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