在普通元素定性分析程序中,于银组及铜锡组分离后,用氢氧化铵及硫化铵沉淀之元素,以往称铁铝组,后改称铁锌组,最近之Noyes-Swift 氏定性分析又改称铝镍组,内包括铝,铬,锌,镍,钴铁及锰共七个元素。铝镍两组之分离,铝组及镍组中各元素之相互分离,常根据各个游子化学性状之差别以定分离之步骤。分离之步骤在合理的情形下可以随时更改,是以小组之名称亦可依之而变更。与该组中元素有关之化学性状,一为氢氧化物之溶度。其溶度积常数Ksp 愈小,则其沉淀易 In the qualitative analysis program of common elements, after the silver group and the copper-tin group are separated, the elements precipitated with ammonium hydroxide and ammonium sulfide, formerly known as the iron-aluminum group, later renamed the iron-zinc group, and the recent Noyes-Swift’s qualitative analysis Alleged renamed nickel-nickel group, including aluminum, chromium, zinc, nickel, cobalt and iron total of seven elements. Aluminum and nickel separation of the two groups, the aluminum group and the nickel group in the separation of the various elements, often according to the wandering chemical properties of the difference in order to set the separation step. The steps of separation can be changed at any time under reasonable circumstances. The name of the group may also be changed accordingly. Chemical elements related to the elements in the group, one is the solubility of the hydroxide. The smaller its solubility product constant Ksp, its precipitation is easy