Care must be exercised to assure that an adequate seal exists between elements of the cassette. The pumps should be monitored during sampling.Ī three-piece cassette constructed of polystyrene designed to hold a 37 mm diameter filter should be used. The samplers should be cleaned prior to sampling. It should operate at a flow rate of 7.4 plus or minus 0.2 liters/minute. The instrument selected for monitoring is the Lumsden-Lynch vertical elutriator. T 1,T 2.Tn=the number of hours spent in a given location Ĭ 1,C 2.Cn=the dust concentration in the same location.Ī time-weighted average concentration should be computed for each worker and properly logged and maintained on file for review. The daily time-weighted average (TWA) exposure of each worker can then be determined by using the following formula: Samples in each work area should be gathered simultaneously or sequentially during a normal operating period. In order to avoid filter overloading, sampling time may be shortened when sampling in dusty areas. Sufficient number of 6-hour area samples in each distinct work area of the plant should be collected at locations which provide representative samples of air to which the worker is exposed. ![]() The sampling procedures must be designed so that samples of the actual dust concentrations are collected accurately and consistently and reflect the concentrations of dust at the place and time of sampling. Hazardous Substances and Processes Return to indexĪir Sampling and Analytical Procedures forĭetermining Concentrations of Cotton Dust Control of Hazardous SubstancesĪrticle 109.
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