双表面活性剂增敏动力学光度法测定痕量铜的研究

[目的]建立一种新的测定痕量铜的方法。[方法]在NH3-NH4Cl缓冲溶液(pH值9.76)中,阴离子表面活性剂十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)共同存在的条件下,Cu2+对H2O2氧化硫堇的褪色反应具有强烈的催化作用,据此建立了双表面活性剂增敏动力学光度法测定痕量铜的新方法。[结果]该方法的线性范围为0.004~0.480μg/ml,检出限为2.50×10-3μg/ml,催化反应的表观活化能为32.05 kJ/mol。[结论]该方法灵敏度高,操作简便、快速,可用于水样中痕量铜的测定。

Kinetic Spectrophotornetric Determination of Trace Copper at Presence of Dual Surfactants

[Objective] The research aimed to establish a new catalytic kinetic spectrophotometric method for the determination of copper ion.[Method] A new catalytic kinetics spectrophotometic method was proposed for the determination of trace copper ion.It was based on the catalyze effect of copper on the oxidation of thionine by H2O2 in a buffer solution of NH3-NH4Cl at pH value of 9.76,and the oexist under conditions of the anionic surfactants of SDS and SDBS.[Result] The linear range of this method was 0.004-0.480 μg/ml,and the detection limit was 2.50×10-3μg/ml,apparent activation energy was 32.05 kJ/mol.[Conclusion] This method was rapid,accurate and convenient for the determination of trace copper in water samples.