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信石的理化鉴别,据《中药鉴定学》(成都中医学院主编.上海科学技术出版社,1980:515)记载为“闭口管中加热,生白色升华物”。但由于信石除主含三氧化二砷(As_2O_3)外,还常含有硫、铁等杂质,而硫也易升华,因而对实验有所干扰,今采用盐酸溶解的方法,结果明显,现介绍如下:取信石粉末约0.1g,
The physical and chemical identification of Shining Stone is described as “heating in a closed tube and white sublimation material” according to “Chinese Medicine Identification” (edited by Chengdu Institute of Traditional Chinese Medicine. Shanghai Science and Technology Press, 1980: 515). However, due to the addition of arsenic trioxide (As_2O_3), the concretion often contains sulfur, iron and other impurities, and sulfur is also easy to sublimate, which interferes with the experiment. This method of dissolution with hydrochloric acid has obvious results. It is introduced as follows: About 0.1g of stone powder,