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Montrose Chemical Corporation of California, Torrance, California. Task II. Monochlorobenzene survey report of the plant contact.
Cohen JM; Diamond P
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, IWS 100-10, 1977 Jun; :1-25
In order to determine whether additional industrial hygiene surveys to quantify worker exposure to monochlorobenzene (108907) (MCB) were justifiable, a study was undertaken at a DDT manufacturing facility in Torrance, California, where MCB was used in the manufacture of DDT. Very low concentrations of MCB were identified in the background airborne levels near the facility. Of the 135 persons employed at this facility, 14 to 16 individuals may have been exposed to MCB. This included those workers involved in MCB receiving areas and DDT rework areas. Exposure levels which were recorded were below the threshold limit value. DDT was produced in a fairly open structure with both natural and forced ventilation to keep worker exposures to a low level. The potential for MCB exposure was greatest when a quality control sample was taken and when DDT scrap was added to the rework area. During a simulation of the rework operation, a short duration concentration of 6.58 parts per million was obtained. The potential did exist for short term, higher levels of exposure. The potential for exposure to DDT (50293) far outweighed the potential for exposure to MCB. The authors conclude that additional studies should be made at the facility, emphasizing DDT exposures.
NIOSH-Author; NIOSH-Survey; Field-Study; IWS-100-10; Region-9; Chlorinated-hydrocarbons; Chemical-manufacturing-industry; Pesticides; Agricultural-chemicals; Chemical-industry-workers; Air-quality-monitoring; Organic-solvents; Chlorinated-benzenes
Field Studies; Industry Wide
NTIS Accession No.
National Institute for Occupational Safety and Health
Stanford Research Institute, Menlo Park, California
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division