Brief introduction of barium metal

Directory 1 Pinyin 2 English reference 3 GB No.4 CAS No.5 Chinese name 6 English name 7 Alias of metallic barium 8 Molecular formula 9 Appearance and properties 10 molecular weight1boiling point 65 438+02 melting point 13 solubility 14 density/ Kloc-0/6 Hazard 16. 1 Toxicological Data and Environmental Behavior 20 Laboratory Monitoring Method 2 1 Environmental Standard 22 Emergency Treatment of Leakage 23 Protective Measures 24 First Aid Measures 1 Pinyin jīn shǔ bèi

2 British reference barium

3 GB number 43009

4 CAS number 7440393

5 Chinese name barium metal

6 English name barium

7 metal barium alias barium

8 molecular formula Ba

9 silvery white metal, with shiny appearance and performance, yellow when containing nitrogen, slightly malleable.

10 molecular weight 137.33

1 1 boiling point 1640℃

12 melting point 725℃

Solubility 13 is insoluble in inorganic acids and common solvents.

14 density Relative density (water 1)3.55

15 is unstable.

16 dangerous metal barium is flammable when wet and has high chemical reaction activity; Heating above the melting point can spontaneously ignite; React violently with oxidant; Reaction with water or acid will release hydrogen and heat, which will lead to combustion.

16. 1 danger sign 10 (flammable substance when wet)

17 is mainly used to make barium salt, and also used as getter, nodulizer and degassing alloy.

18 Invasive route of health hazards: inhalation and intake.

Health hazard: metallic barium is almost nontoxic. Soluble barium salts, such as barium chloride and barium nitrate. (Barium carbonate forms barium chloride when it meets stomach acid, which can be absorbed through the digestive tract), which can cause serious poisoning after eating, and there are symptoms of digestive tract, progressive muscle paralysis, myocardial involvement, hypokalemia and so on. Respiratory muscle paralysis and myocardial injury can lead to death. Inhaling the dust of soluble barium compounds can cause acute barium poisoning, which is similar to oral poisoning, but the digestive tract reaction is mild. Workers exposed to barium compounds for a long time have symptoms such as salivation, weakness, shortness of breath, swelling and erosion of oral mucosa, rhinitis, tachycardia, hypertension and alopecia. Long-term inhalation of insoluble barium compound dust, such as barium sulfate, can cause barium pneumoconiosis.

19 toxicological data and risk characteristics of environmental behavior: the chemical reaction activity is low, and it can spontaneously ignite in the air when heated to a molten state, but the dust can burn at room temperature. Heat, flame or chemical reaction can cause combustion and explosion. It reacts violently with water or acid, releasing hydrogen to cause combustion. Contact with fluorine, chlorine and so on. There will be a violent chemical reaction. In case of acid or dilute acid, it will cause combustion and explosion.

Combustion (decomposition) product: barium oxide.

20 laboratory monitoring method potentiometric titration (GB/T 1467 193, water quality)

Atomic Absorption Spectrometry (GB/T 1550695, Water Quality)

Atomic absorption spectrometry "Manual for Testing, Analysis and Evaluation of Solid Waste" translated by China National Environmental Monitoring Center, etc.

2 1 Environmental standard The maximum allowable concentration of harmful substances in the air of the workshop in the former Soviet Union is 0.5 mg/m3; China (GB/T 1 1484893) groundwater quality standard (mg/L) Class I is 0.01; Class Ⅱ 0.1; Class ⅲ1.0; Class iv 4.0; The maximum allowable concentration of harmful substances in drinking water source water in China (to be promulgated soon) is 0.7mg/L 22 above Class V 4.0. Conduct emergency treatment, isolate the leaked and polluted area and restrict access. Cut off the fire. It is suggested that emergency personnel wear self-priming filter dust mask and fire-proof clothing. Don't touch the leak directly. Small amount of leakage: avoid dust and collect it in a dry, clean and covered container with a clean shovel. Transfer and recovery. A large number of leaks: covered with plastic sheets and canvas to reduce scattering. Use spark-free tools for transfer and recovery.

23 Protective measures Respiratory system protection: Generally, special protection is not needed, but it is recommended to wear a self-priming filter dust mask under special circumstances.

Eye protection: Wear chemical safety glasses.

Physical protection: Wear chemical protective clothing.

Hand protection: wear rubber gloves.

Others: Smoking is strictly prohibited in the workplace. Pay attention to personal hygiene.

24 First-aid measures Skin contact: Take off the contaminated clothes and rinse the skin thoroughly with soapy water and clean water.

Eye contact: Lift eyelids and rinse with running water or normal saline. See a doctor.

Inhalation: leave the scene quickly and go to a place with fresh air. Keep the respiratory tract unobstructed. If you have difficulty breathing, give oxygen. If breathing stops, give artificial respiration immediately. See a doctor.

Ingestion: Drink enough warm water to induce vomiting, and use 2%5% sodium sulfate solution for gastric lavage to induce diarrhea. See a doctor.