Hydrochloric acid is one of the most common hazardous materials involved in chemical spills. Estimating the size of the toxic gas cloud associated with a amjor spill is complicated by the difficulties inherent in calculating the eavporation rate from an acid solution. The evaporation rate depends on the concentration, which can change significantly as the pool evaporates. This papr presents a simple method for estimating the time-dependent concentration of the pool, release rate and downwind dispersion of hydrogen chloride from the spill of an aqueous solution.
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