4-5-3 水素，エネルギーキャリアとしてのアンモニアの安全性

抄録

NFPA flammability of NH₃ is low because of high flash point. The category of the flammability increases with decreasing of the flash point, approaching to constant value 4. However, Japanese GHS flammability of ammonia is high, because the classification of flammability is defined by explosive (combustible) range in air. NFPA health hazard of NH₃ has high value 3. The ratio of NH₃ accidents divided by the high pressure gas accidents is about 10%. The water solubility of NH₃ is high, although NH₃ vapor concentration and NH₃ concentration in the water solution have similar high values at 298 K. NH₃ storage materials for the vapor concentration (vapor pressure) and the nitrogen concentration in water lowering will be required to reduce the negative effects on the environment.