Hydrogen sulfide

Hydrogen sulfide (sulfon, H2S) is a colorless gas with the smell of rotten eggs, temperature of boiling of 60.8 degrees. Solubility in water 2,91 at the temperature of 20 degrees. Found in the air the smell even in low concentrations. In the nature meets in water mineral springs, seas, volcanic gases. Is formed by the decomposition of proteins without oxygen. Can be emitted into the air in many industries, chemical, textile and leather industry, in mining and processing of oil, as well as from the sewer network.
Hydrogen sulfide is a strong poison, causing acute and chronic poisoning. Has local irritation and General toxic effect. At a concentration of 1.2 ml/l poisoning is developing with lightning speed, death due to acute oppression of the processes of tissue respiration. Upon termination of performance even in severe poisoning victim can be restored to life.
At a concentration of 0.02-0.2 mg/l is observed headache, dizziness, chest tightness, nausea, vomiting, diarrhea, sometimes, loss of consciousness, convulsions. With the concentration of 0.2 mg/l lost the sense of smell, and therefore increases the risk of poisoning because delayed early exit from polluted atmosphere. The toxicity of hydrogen sulfide increases with the increase in air temperature and in the presence of other chemicals (hydrocarbons).
First aid : remove victim from exposure, inhalation of oxygen, artificial respiration; a means of stimulating the respiratory center (1% solution lobelina 1 ml), warm body.
Prevention is sufficient ventilation and sealing of certain manufacturing operations. Maximum permissible concentration in the air of working premises 10 mg/m3; in a mixture of hydrocarbons - 3 mg/m3. During the descent working in wells and tanks containing hydrogen sulphide, they must use gas masks and rescue belts on the ropes. Mandatory title in the mines, in the places of production and enterprises of oil refining.