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Miniaturized tapered element oscillating microbalance performance in a person-wearable dust monitor.

Volkwein-JC; Vinson-RP; Tuchman-DP
Proceedings of the AAAR 23rd Annual Conference, October 4-8, 2004, Atlanta, Georgia. Mount Laurel, NJ: American Association for Aerosol Research, 2004 Oct; :279
A personal dust monitor (PDM) was developed to measure respirable coal mine dust mass to provide accurate exposure data. The PDM uses a tapered element oscillating microbalance to measure the mass of dust deposited on a filter, continuously displays cumulative exposure concentration, and records this as well as other environmental and instrument data for subsequent analysis. The accuracy and precision of the instrument was determined by comparison to gravimetric filter samplers for shift length samples in the laboratory and in four mines. Zero drift, effect of temperature fluctuations, and impact of water sprays on mass determinations were measured. Laboratory results with different coal types and size distributions showed that there is a 95% confidence that the individual PDM measurements were within +/- 25% of the reference measurements. Laboratory data show that the stability of the mass measurement is similar to that of standard microbalance mass determinations. Mine test results indicate that data taken with adjacent PDM and reference samplers are indistinguishable. Trials are underway to evaluate the long term durability and accuracy of the instrument under typical use conditions.
Dusts; Dust-particles; Dust-measurement; Respirable-dust; Coal-dust; Coal-mining; Laboratory-testing; Sampling; Sampling-methods
CDC/NIOSH PO Box 18070, Pittsburgh, PA 15236
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Proceedings of the AAAR 23rd Annual Conference, October 4-8, 2004, Atlanta, Georgia