Environmental science

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Estimate the chronic daily intake of 1,1,1-trichloroethane from exposure to
city water supply that contains a 1,1,1-trichloroethane concentration equal to the
drinking water standard of 0.2 mg/L. Assume the exposed individual is a child who
consumes water at the child rate for 5 years, that she swims once a week for 30
minutes, and that she takes a short (10 minute) bath every day. Assume her average
age over the exposure period is 8. Assume that the average air concentration of 1,1,1-
trichloroethane during the bath is 2 µg/L. Assume the dermal uptake form water (PC) is
0.0060 m/h and that direct dermal absorption during bathing is no more than 50 percent
of the available 1,1,1-trichloroethane because she is not completely submerged.

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