Sulphuric acid

Sulphuric acid, H2SO4,strong dibasic acid. Concentrated sulphuric acid (colorless oily liquid, the density of 1.84) contains 98,3% H2SO4; boils at a temperature 338 degrees. In aqueous solutions of sulfuric acid dissociates to the ions. Solutions of sulphuric acid react with the active metals and release of hydrogen and education salts. Concentrated sulphuric acid is a strong oxidant. As technical sulphuric acid are often contaminated with arsenic compounds, when its action on metals perhaps the selection of highly toxic arsenic hydrogen (see Arsenic). Concentrated sulphuric acid absorbs water vapor from the air, and dehydrates organic materials, Obuhova some of them (wood, cotton, sugar). Dissolution of concentrated sulfuric acid in water is accompanied by a strong warming. Sulfuric acid forms average salt - sulfates, for example Na2SO4, salt and sour - hydrosulfate (bisulfate), for example NaHSO4. Sulfuric acid is widely used in engineering and during laboratory studies.
After contact with skin concentrated sulphuric acid causes severe burns, when healing which remain flat brown-purple scars. Especially dangerous from a sulfuric acid in the eyes. Inhalation of air containing the smallest droplets of sulfuric acid, causes irritation of the upper respiratory tract, especially the mucous membrane of the nose, burning in the eyes, redness of the conjunctiva of the eye. At higher concentrations may appear bloody sputum, vomiting (sometimes with blood); prolonged inhalation of vapours of sulfuric acid can cause inflammation of the bronchi and lungs.
The production of sulphuric acid (health). In the production of sulfuric acid, workers are exposed to dust released for crushing, drying and outdoor transportation of mineral raw materials, high temperature and the heat from kilns, nitrogen oxides, sulfur dioxide and sulfuric acid vapors.
Hygiene requirements in the production of sulfuric acid are primarily to automation of production and sealing of process equipment, thermal insulation of furnaces and communications. Means of individual protection are dust-proof suits and costumes made of acid resistant fabric, rubber boots and gloves, goggles and masks (grade b or M). Systematic monitoring of protective clothing and gas masks.
First aid for inhalation of fumes sulfuric acid: fresh air, inhalation 2% soda solution, drinking warm milk with soda or Borjomi, cough - codeine (0.015 g 3 times a day), dionin (0.005 g 3 times a day). At hit of acid on the skin or mucous membranes, wash immediately with plenty of water, it is better with soap and water, or 0.5-1% solution of soda. With burns of II-III degree after primary treatment of the affected area with water then use ointment dressing (penicillin ointment, Vishnevsky ointment, streptocida or penicillin emulsion and others)According to the prescriptions - fighting shock: warm, excessive drinking, morphine (1% - 1 ml subcutaneously), promedol (1%to 2 ml subcutaneously). At hit of a sulfuric acid in the eyes of the copious lavage with running water to let on 1-2 drop of 0.5% solution dikaina with adrenaline. Maximum permissible concentration of vapours of sulfuric acid and sulfur dioxide in the air of industrial premises is 1 mg/m3, sulphurous anhydride - 10 mg/m3. Cm. also Acid Poisoning.