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目前合成氨厂对铜液中总铜的分析一般采用碘量法。该法分析结果比较准确。但在分析过程中需加热微沸,流水冷却,手续比较繁杂。据有关资料提出,EDTA 在 PH=2.5～10时与铜的络合比为1∶1,其络合物的稳定常数(对数)=18.8。当 EDTA 与 Cu 络合后,用碘量法检验不到游离的 Cu~(++),可见络合是很完全的。但由于铜液本身颜色很深,直接滴定
At present, the ammonia plant generally uses iodometry to analyze the total copper in copper liquid. The analysis of the law results more accurate. However, in the analysis process need to heat micro-boiling, water cooling, procedures are more complicated. According to the relevant data, the complexing ratio of EDTA to copper is 1: 1 at pH = 2.5-10, and the stability constant (logarithm) of the complex is 18.8. When EDTA complexed with Cu, the free Cu ~ (++) could not be detected by iodometric method, showing that the complexation was complete. However, the color of copper liquid itself is very deep, direct titration