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目前广泛应用的阳离子定性分析方法是在100多年以前即已提出的“硫化氢”法。这种方法是以硫化氢为主要分组试剂,即使用硫化氢在不同的氢离子浓度下,沉淀金属硫化物的方法。惟此方法尚有缺点,如硫化氢的发生比较烦琐,不易控制;硫化氢有恶臭,有毒、能腐蚀机械和器皿等。虽然在半微量定性分析中,硫化氢用量较少,也可以采用硫化氢简易发生器。但在班次较大的实验室中,问题仍然严重。故从保护人身的健康出发,早就有人建议,阳离子的分组完全不用硫化氢或企图用其他的含硫化合物来代
Currently widely used qualitative analysis of the cation is more than 100 years ago that has been proposed “hydrogen sulfide” method. This method is based on hydrogen sulfide as the main grouping reagent, which uses hydrogen sulfide at different hydrogen ion concentrations, the method of precipitation of metal sulfides. However, this method has drawbacks, such as the occurrence of hydrogen sulfide more cumbersome and difficult to control; hydrogen sulfide has foul, toxic, can corrode machinery and utensils. Although hydrogen sulfide is less used in semi-quantitative qualitative analysis, it is also possible to use a simple hydrogen sulfide generator. However, the problem is still serious in the higher-frequency laboratories. Therefore, starting from the protection of personal health, it has long been suggested that the cationic groups do not use hydrogen sulfide at all or attempt to substitute other sulfur-containing compounds