【摘要】 <正>极谱测定铜过去常用氨底液法,但灵敏度不高,近年来报导了一些铜—硫氰酸根络合物在不同组成的底液中吸附催化波的研究。经试验,本文拟订了用抗坏血酸把Cu(Ⅱ)还原成Cu(I)后,在pH=4下,更多还原

【Abstract】 An adsorptive polarographic method for determination of trace amounts of copper in Cu-SCN system has been suggested. Using ascorbic acid Cu2+ is reduced to Cu1 + , which reacts with neocuproin selectively forming copper ( I ) complex, this complex is then extracted with CHC13. After seperation, the peak current of copper appears at -0.52V in a solution of NH2OHHC1 - KSCN (pH=4) as supporting electrolyte. The peak height is in direct proportion to the concentration of copper in the range of 0-10ng/25ml. This method has advantages of simplicity, rapidity high sensitivity and selectivity. The method has been applied to determine trace amounts of copper in electrolytic nickel solution.更多还原