一、引言在化学分析中,目前习用着经典的阳离子定性分组与系统分析方法。虽然有些学者把个别阳离子放在不同的分析组中去鉴定,但是,系统分析的条件与各分析组所应用的组试剂,基本上是相同的。Д.И.门捷列夫化学元、素周期律的发现,促进了分析化学理论的进一步发展,尤其是阳 First, the introduction In chemical analysis, the current habit of using the classic qualitative cation and system analysis methods. Although some scholars have identified individual cations in different analysis groups, the conditions for the system analysis are basically the same as the group reagents used in each analysis group. Д.И. Mendeleev’s discovery of the chemical element and the periodicity of the prime promotes the further development of analytical chemistry theory,