在阴离子的系统分析中,两个新的分組試剂已被采用,即Zn(No_3)_2[或Zn(Ac)_2]和Cd(NO_3)_2。阴离子和硷性基团可被組試剂Zn(AC)_2和Cd(NC_2)_2沉淀完全。研究結果表明:A_3O_4~≡,TeO_4~≡,TeO_3~≡,WO_4~≡,SeO_3~≡PO_3~≡可被Zn(AC)_2定量的沉淀,而SeO_4~≡可被Cd(NO_3)_2沉淀,因此两个試剂可用于重量分析,测定上述阴离子。这样就給形成阴离子的許多元素提供了簡便而准确的分析方法。 In the systematic analysis of anions, two new grouping reagents have been used, Zn (No_3) _2 [or Zn (Ac) _2] and Cd (NO_3) _2. Anions and basic groups were completely precipitated by the group reagents Zn (AC) 2 and Cd (NC 2) 2. The results show that the precipitates of A_3O_4 ~ ≡, TeO_4 ~ ≡, TeO_3 ~ ≡, WO_4 ~ ≡, SeO_3 ~ ≡PO_3 ~ ≡ can be quantified by Zn (AC) _2 and SeO_4 ~ ≡ can be precipitated by Cd (NO_3) Therefore, the two reagents can be used for gravimetric analysis to determine the above anions. This provides a convenient and accurate method of analysis for many elements that form anions.