一、引言 CFC12是一种含氯无氢氟里昂,化学式为CCl_2F_2,是家用电冰箱和汽车空调中广泛使用的工质。在大气环境中寿命可长达120年。因此一旦逸散到大气中就有足够的时间升至同温层,在紫外线的照射下CFC12分解产生的Cl即可与臭氧(O_3)产生链锁反应,促使O_3分解,严重地消耗臭氧从而削弱了臭氧对短波紫外线的阻挡作用。导致人类皮肤癌、白内障发病率的增加;破坏人类的食物链及产生附加的温室效应。 为保护人类赖以生存的自然环境,1987年国际上签署了“控制破坏大气臭氧层物质 I. Introduction CFC12 is a chlorine-free hydrogen freon, chemical formula CCl_2F_2, is widely used in domestic refrigerators and automotive air conditioners. Life expectancy in the atmosphere up to 120 years. Therefore, once escape to the atmosphere there is enough time to rise to the stratosphere, under UV irradiation CFC12 decomposition of Cl and ozone (O_3) can produce a chain reaction, to promote O_3 decomposition, and thus severely depleted of ozone and thus weakened The ozone on the short-wave ultraviolet blocking effect. Leading to an increase in the incidence of human skin cancer and cataracts; disruption of the human food chain and resulting in additional greenhouse effects. In order to protect the natural environment on which mankind depends, in 1987 the world signed the "Control of Atmospheric Ozone Depletion Substances