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Mineral Dust and Diesel Exhaust Aerosol Measurements in Underground Mines.
Abstract in Proc of American Industrial Hygiene Assoc 1988 :1 pages
Two source apportionment techniques have been applied to U.S. Bureau of Mines measurements of mineral dust and diesel exhaust aerosol concentrations in diesel-equipped underground coal, metal, and nonmetal mines. The first technique, using results of size- selective sampling, is based on modeling aerosol size and the premise that the diesel exhaust portion of the aerosol is predominately submicrometer and the mineral dust portion is mostly greater than 1 um in size. The second techniuqe, chemical mass balance (cmb) modeling, was used to referee the analysis of diesel exhaust and mineral dust aerosol concentrations in the diesel- equipped mines from the size-selective sampling results. Aerosol size distributions, used in the size modeling technique, were obtained with a microorifice uniform deposit impactor (moudi). Concurrent samples of respirable mine aerosol for trace element analysis used in the cmb modeling were obtained with a dichotomous sampler. This sampler separates respirable aerosol into fine and coarse size fractions at an aerodynamic diameter of 0.7 Um. Trace element concentrations for in-mine aerosol sources and the dichotomous samples were measured using instrumental neutron activation analysis. Cmb analysis of the coal mine samples confirms the original premise for using aerosol size to separate diesel exhaust and mineral dust aerosol during sampling. After correcting for the presence of mineral dust in the fine aerosol fraction, analysis of the corresponding moudi size distributions yielded estimates of respirable mineral and diesel exhaust aerosol co
Abstract in Proc. of American Industrial Hygiene Assoc., 1988, P. 85
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