Abstract
Field studies were performed to develop and evaluate emission factors for a parts-washing operation using toluene. Ventilation, process, and air concentration data were collected first for the development of an emission factor, then later for evaluation studies. Air concentrations and ventilation rates were used in mass balance models to determine emission rates. The average emission rate was 5.4 grams toluene per minute. The modeled emission rates compared favorably with estimates of toluene use. Emission and process rates were used to develop emission factors. The emission factor for parts washing was 1.6 mg toluene per square centimeter of part washed (r2=0.41, p <0.05). To evaluate this emission factor, process data and ventilation measurements were collected 6 months later to predict air concentrations. Predicted concentrations near the source ranged from 0 to 320 mg/m3, and for the rest of the plant from 0 to 2.8 mg/m3. Concentration measurements were taken but were not available until after the pre...
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