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Effects of Low Quartz Mass Loading and Spatial Variability on the Quartz Analysis of Surface Coal Mine Dust Samples

机译:低石英质量负荷和空间变异性对露天煤矿粉尘样品石英分析的影响

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Monitoring the miner respirable quartz dust exposure for compliance with U.S. federal regulations is mandatory to protect the health of coal miners. For samples collected at coal mines, the U.S. Mine Safety and Health Administration (MSHA) uses the P7 method for respirable quartz analysis. The results of this study show that, for samples collected within the environment of an enclosed cab, (1) the P7 method may be precise and linear with quartz mass loadings as low as approximately 5 micrograms of quartz, (2) the environmental dust mass spatial variablility, even within an enclosed cab environment, is the dominant factor of variability in propagation of error in estimating the percentage of quartz of the obtained dust sample for weighing precision values up to at least 0.02 micrograms.

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