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催化动力学光度法测定痕量Cu(Ⅱ)的研究已有报道.本文发现、在稀硫酸介质中,痕量Cu(Ⅱ)对过氧化氢氧化碱性品红的褪色反应有强烈的催化作用.研究了该反应的动力学条件,建立了一个新的测定痕量Cu(Ⅱ)的方法.本方法灵敏度高,为3.6×10~(-10)g·ml~(-1),测定范围为0.05～0.70μg/25ml,重现性好.用于测定水样中的痕量Cu(Ⅱ),获得满意的结果.1 试验部分1.1 仪器与试剂721 型分光光度计沸水浴(100±0.5℃)过氧化氢溶液:20%,取30%的过氧化氢20ml,
Catalytic kinetic spectrophotometry for the determination of trace amounts of Cu (II) has been reported.It has been found that trace amounts of Cu (II) strongly catalyze the discoloration of basic fuchsin by hydrogen peroxide in dilute sulfuric acid The kinetic conditions of this reaction were studied and a new method for the determination of trace Cu (Ⅱ) was established.The method has high sensitivity of 3.6 × 10 -10 g · ml -1, 0.05 ~ 0.70μg / 25ml, good reproducibility for the determination of trace amounts of Cu (Ⅱ) in water samples to obtain satisfactory results.1 Experimental 1.1 Instruments and reagents 721 spectrophotometer boiling water bath (100 ± 0.5 ° C) Hydrogen peroxide solution: 20%, take 30% hydrogen peroxide 20ml,