Carbon Monoxide—Evaluation of Exposure Potential by Personnel Monitor Surveys

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Abstract
Fixed-station monitors located in a large consolidated warehouse in which gasoline-powered lift trucks are operated disclosed peak concentrations of carbon monoxide (CO) in the range of or above the 1970 threshold limit value (TLV) of 50 ppm. To determine whether employees assigned to this area are exposed to excessive CO concentrations, personnel monitoring surveys were proposed. Attempts to adapt the liquid reagents reported in the literature to the system developed for tetraalkyl lead exposure control met with failure. A manufacturer of length-of-stain detector tubes indicated that the CO tube would provide 4-hour continuous sampling. Recalibration at a rate of 8 ml/min confirmed this report for a range of 30 to 60 ppm. Flow rate and oxygen concentration are the controlling variables. Surveys carried out in either warm- or cold-weather conditions disclosed no exposure conditions which approached the limit of 50 ppm on an 8-hour average basis.

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