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在氰化镀铜溶液里加入高硫酸铵,在室温时能分解为硫酸铜、硫酸铵及二氧化碳,避免了有毒的HCN的生成。反应式如下: 2Na_2Cu(CN)_3+7(NH_4)_2S_2O_3+12H_2O→2CUSO_4+2Na_2SO_4+10(NH)_2SO_4+6CO_2↑将分解后的铜在氨性的条件下,以PAN为指示剂,用EDTA滴定,能迅速而简单地分析氰化镀铜溶液中的铜含量。过量的高硫酸铵不会分解指示剂。镀液中的铁不会妨害分析。操作: (1)用吸量管准确吸取1.00毫升氰化镀铜溶液(或者用10毫升吸量管准确吸取氰化镀铜溶液于量瓶中,稀释至100毫升,再取10毫升),于其中加入
Adding ammonium sulfate to copper cyanide solution dissolves into copper sulfate, ammonium sulfate and carbon dioxide at room temperature, avoiding the generation of toxic HCN. The reaction is as follows: 2Na_2Cu (CN) _3 +7 (NH_4) _2S_2O_3 +12 H_2O → 2CUSO_4 +2Na_2SO_4 +10 (NH) _2SO_4 +6 CO_2 ↑ The decomposed copper under the conditions of ammonia, PAN as an indicator, with EDTA Titrimetric analysis of copper in cyanide copper solutions quickly and easily. Excess ammonium sulphate does not decompose the indicator. Iron in the bath will not hinder the analysis. Operation: (1) Pipette 1.00 ml of copper cyanide solution (or 10 ml pipette accurately in a volumetric flask with a 10 ml pipette, dilute to 100 ml and then 10 ml) Which join