According to the investigation, this pungent aerosol contains a small amount of hydrogen chloride. Hydrogen chloride is a very commonly used chemical raw material and a corrosive gas. Hydrogen chloride is colorless, but it tastes and is pungent. It is very harmful to respiratory mucosa and corrosive to eyes and skin. If you inhale too much hydrogen chloride, it will cause rhinitis, laryngitis, pneumonia or headache. The accident of hydrogen chloride leaking into the air was later detected that the content of hydrogen chloride in the air did not exceed the standard, so as long as the crowd was evacuated in time and the aftermath was done well, there should be no big problem.
Hydrogen chloride is colorless and toxic, and it is not easy to be found when it is discharged into the air, but it will produce a pungent smell. White mist is produced because hydrogen chloride meets water vapor in the air, forming a mist similar to water mist, that is, the aerosol with pungent smell that everyone sees. Residents near Wutongqiao have returned home after being evacuated, but they still have a lingering fear, feeling that they have inhaled toxic gas, fearing that this leakage will have an irreversible impact on water, air and their own health problems.
In case of hydrogen chloride leakage, the best emergency measure is to organize the rapid evacuation of personnel in the leaked and polluted areas. If it is a small leak, it needs to be isolated for about 200 meters, and when it is a big leak, it needs to be isolated for about 300 meters, and it is necessary to strictly restrict personnel from entering and leaving. Professionals dealing with these leaks need to wear positive pressure breathing apparatus and chemical protective clothing, enter the leakage site from the upper air inlet, cut off the leakage source, and properly ventilate to accelerate the diffusion. It is best to neutralize hydrogen chloride with ammonia or other lye.