雄黄与光反应的研究进展

摘要

矿物晶体收藏近年来成为一大热点,雄黄晶体艳丽,是地质类博物馆和矿物收藏家收藏的矿物种类之一,然而光照下雄黄不稳定,雄黄与光的反应倍受关注.因硫砷化合物的光化学灵敏度,硫砷化合物是一种重要的光学材料,国外开展了雄黄与光作用的反应产物和机理研究工作,雄黄与光的反应产物有副雄黄、砷华和x-物相,在光照下雄黄通过As4S5分子间接地转变为副雄黄.作为药用矿物,As2O3是药用雄黄的组成部分,又是毒性成分,As2O3的来源与受到的高热和光照等有关,国内中医药界加强了对雄黄的物质成分的研究,还需加强光照对药用雄黄成分影响的研究.%In recent years mineral crystals have been collected by more and more people in China.Because of its vibrant color,brilliant natural luster and incredible sculptural qualities,realgar crystal is popular for geological museums and private mineral collectors.However,when exposed to sunlight,unprotected realgar develops a surface coating of friable yellow material.Due to their photochemical sensitivity,arsenic chaleogenides are important materials for use in optics.A lot of research work on light induced alteration of realgar was carried out in foreign countries.Reaction products of realgar and light are pararealgar,arsenolite and x-phase.Realgar is indirectly transformed into pararealgar via the As4S5 molecule.Realgar is a kind of Chinese traditional medicine,but the AS2O3 in realgar is toxic.The content ofAs2O3 in realgar is related to such factors as high temperature and light.A lot of research work on composition of realgar as Chinese traditional medicine has been carried out,but the study of light induced alteration of realgar should be strengthened in China.