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Methylene chloride survey report, Conoco Chemicals, Westlake, Louisiana, Final Report Task III.
NIOSH 1979 Mar; :1-59
Occupational exposure to methyl-chloride (74873) was studied. An industrial hygiene survey was conducted at Conoco Chemicals, Westlake, Louisiana, to determine methyl-chloride concentrations. Breathing zone samples were taken by charcoal tubes and sampling pump assembly from 14 methyl-chloride production workers for about 8 hours on all four shifts. The loader group was exposed to the highest mean concentration of 1.8 parts per million (ppm) with top operators exposed to a mean concentration of 0.7ppm and the first controller, 0.2ppm. The average exposure to workers was 1.1ppm. Eight hour time weighted average (TWA) concentrations for these area samples ranged from 0.8 to 5.9ppm with an average concentration of 1.7ppm. All of the area samples showed methyl-chloride recovery in the backup tube (19 to 44 percent of the total amount of methyl- chloride found). The authors conclude that although measurable amounts of methyl-chloride exist, the TWA exposure of workers was below the OSHA standard of 5.00ppm. However, some minor problems exist with the analytical method used to determine methyl-chloride in air.
NIOSH-Contract; Contract-210-76-0158; Health-surveys; Air-sampling; Chlorinated-hydrocarbons; Chemical-manufacturing-industry; Chemical-industry-workers;
Final Contract Report
NTIS Accession No.
SRI International, Menlo Park, California, NIOSH, Cincinnati, Ohio
LA; CA; OH
SRI International, Menlo Park, California
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division