Evaluation of the GMD systems, Inc., thermally-desorbable diffusional dosimeter for monitoring methyl chloride.
The GMD Systems, Inc., thermally-desorbable diffusional dosimeter using Anasorb GM solid sorbent was evaluated for monitoring methyl chloride (CH3Cl) in the workplace. The effects of CH3Cl concentration; dosimeter exposure time; relative humidity, temperature, and face velocity during exposure; excursion exposure behavior; and storage temperature and duration after collection were investigated. Only extremely low face velocities (0.020 m/sec) and storage periods of over 8 days at room temperature or of around 30 days at reduced (refrigerator or freezer) temperatures caused sample degradation. Side-by-side measurements of CH3Cl using the diffusional monitor and a validated charcoal tube method under field conditions yielded statistically indistinguishable results. This diffusional monitor used in combination with Anasorb GM solid sorbent is a satisfactory means of determining CH3Cl exposures in the workplace.
Hahne
R M
RM
Dow Chemical Company, Industrial Hygiene Laboratory, Midland, MI 48674.
D000395:Air Pollutants, Occupational / Q000032:analysis*; D004058:Diffusion; D004784:Environmental Monitoring / Q000295:instrumentation*; D005069:Evaluation Studies as Topic; D006801:Humans; D008737:Methyl Chloride / Q000032:analysis*; D008956:Models, Chemical
D000395:Air Pollutants, Occupational; D008737:Methyl Chloride