【摘要】 在碱性介质中,铜对空气氧化二苯碳酰二肼显红色的反应有较强的催化作用,据此建立了痕量铜的新催化动力学光度法。本法铜含量在0.05～0.25μg/27mL范围内符合比尔定律,表观摩尔吸光系数为1.0×10⁷L·mol^-1·cm^-1。用本法测定了自来水、桔子水及标准水样中的铜,获得满意的结果。更多还原

【Abstract】 Based on the catalytic effect of Cu（Ⅱ） on the chr-omogenic oxidation of diphenylcarbazide by air in a basic medium, a new catalytic kinetic spectrophotometric method for the determination of trace Cu（Ⅱ） was established. Beer’s law is obeyed for Cu（Ⅱ） in the range of 0. 05～0. 25μg/27mL. The apparent molar absorptivity is 1.0×10⁷L·mol^-1·cm^-1. The relative standard deviation （n=6） is 3.9～5.0% and the recoveries is 90～106%. The method has been used to determine Cu （Ⅱ） in tap waters, orangeade and standards water with satisfactorry results.更多还原