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- W86973379 abstract "The relationship between respiratory tract deposition of airborne arsenic (As) and urinary excretion of total As was investigated in five workers during and following a 9-day maintenance activity involving exposure to high concentrations of As in fly ash. Full-shift air samples were collected in the breathing zone of each worker during each day of exposure. The resulting data on As mass versus particle size were analyzed using the U.S. environmental protection agency particle deposition model to estimate the deposited dose of As associated with the exposures. The total deposited dose of As over the exposure period was then compared with the total excretion of As in 24 hr urine samples collected during, and for two days following, the exposures to estimate the bioavailability of As in fly ash. The observed particle distributions consisted primarily of large, nonrespirable particles, greater than 6 μm in aerodynamic diameter, which would be expected to deposit in the nasopharynx or tracheobronchial region rather than in the deep lung. The average deposition efficiency was on the order of 75%, and the calculated bioavailabilities (fraction of deposited As excreted in urine) for each subject ranged from 1% to 25%, with an average value of 11%. These results support the conclusions of a previous study performed at the same location, which found that the relative urinary excretion of As from fly ash was much lower than had been reported for other exposures to airborne As, such as at copper smelters." @default.
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- W86973379 date "1999-01-01" @default.
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- W86973379 title "Airborne Exposure to Arsenic Occurring in Coal Fly Ash" @default.
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- W86973379 doi "https://doi.org/10.1016/b978-008043648-7/50005-4" @default.
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