Risk Analysis of Environmental Pollution by Secondary Hydrogen Chloride from Leakage of Phosphorus Trichloride

This study aims to analyse the influence of the pollution of hydrogen chloride which is the side effect of the leakage accident of a 50m(3) phosphorus trichloride tank. When the leakage source intensity is 1.06kg/s with the leakage time of 30 minutes, and the distance is about 2700m away from the highest allowable concentration (0.05mg/m(3)) in air of residential areas, which goes beyond about the distance of 700m over the "Comprehensive emission standard of air pollutants" (GB16297-1996) table 2 (100mg/m(3), new sources of pollution emission limits), however, the mean value of hydrogen chloride concentration beyond 400m is less than the that of IDLH (immediately dangerous to life or health concentration), and no half lethal concentration(LC50) appears. The scope and extent of pollution can be significantly reduced by timely using fire water to eliminate smoke to change hydrogen chloride into hydrochloric acid fog and make them drop in a lower position.