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定性分析在生产实践中具有一定价值,所以目前在化学分析中还占有一定位置,定性分析可分为系统分析和分别分析。目前采用的系统分析主要有“硫化氢系统和“非硫化氢系统”,它们的根本区别就在于分析系统中是否使用硫化氢作组试剂。分析化学(北京农大,1979)所介绍的为两酸两碱系统,按该书介绍,第一、二、三组阳离子即易溶离子组、氯化物组、硫酸盐组阳离子的鉴定,只要按规定的步骤去做,一般检出效果明显。但四、五组阳离子中Cu~(2+)、Co~(2+)检出手续繁琐,Mg~(2+(,Zn~(2+)、Cd~(2+)不易检出,针对上述五种离子,我们进行了反复实验,得出了简单易行的分离鉴定方法。第四五组阳离子分析程序表
Qualitative analysis has some value in production practice, so at present, it still occupies a certain position in chemical analysis. Qualitative analysis can be divided into systematic analysis and separate analysis. The current system analysis mainly includes “hydrogen sulfide system and” non-hydrogen sulfide system ", and their fundamental difference lies in whether hydrogen sulfide is used as a reagent in the analysis system. Analytical Chemistry (Beijing Agricultural University, 1979) Two alkaline systems, according to the book introduction, the first, second and third groups of cation that is soluble ion group, chloride group, sulfate group cation identification, as long as the prescribed steps to do, the general detection effect is obvious, but four (2 +), Zn (2 +) and Cd (2+) were not detected easily in the five groups of cations, and the detection procedures of Cu ~ (2+) and Co ~ Species of ions, we conducted repeated experiments, obtained a simple and easy separation and identification methods. The fourth five sets of cation analysis program table