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研究工作所提出的(注)碘量法测定铜和铅的容量方法大大地降低碘化钾的消耗,方法的根据是在过量的硫代硫酸钠存在下用三氯化六氨络钴[Co(CH_3)_6]Cl_3沉澱铜鹽和铅鹽,得到难溶的络合物;用碘量法测定过剩的硫代硫酸钠。我们的研究证明此时铜和铅是定量沉澱的。铜和铅沉澱时所形成络合物的成份作分析时,得到下面的数据:8.52％;Cu;13.35％ Co;25.61％S。对假定组成为[Co(NH_3)_6] 5·Cu(S_2O_3]_3 ·12H_2O(分子量2221.45)的沉澱而言,计算得:8.5
The method of iodometric determination of copper and lead, as proposed in the study (Note), significantly reduces the consumption of potassium iodide based on the use of hexaamminecobalt tetrachloride [Co (CH 3) 3 in the presence of excess sodium thiosulfate ) _6] Cl_3 precipitation of copper salts and lead salts to obtain insoluble complexes; Determination of excess sodium thiosulfate by iodometry. Our research shows that copper and lead are quantitatively precipitated at this time. The following data was obtained when the composition of the complex formed when copper and lead were precipitated: 8.52%; Cu; 13.35% Co; 25.61% S. For the precipitation of the assumed composition [Co (NH 3) 6] 5 Cu (S 2 O 3] 3 · 12H 2 O (molecular weight 2221.45), it is calculated that 8.5