摘要
在示波极谱滴定中,当去极剂切口位于示波极谱图|dE/dt|的最大值附近时,利用Antilg dE/dt~E示波图来指示滴定终点能使终点变化更为敏锐。原来较难进行滴定的一些体系现在可用这种方法滴定。在50Hz的交流电频率下,用氨羧络合剂滴定了Cd^(2+)、Pb^(2+)、Zn^(2+)、Co^(2+),滴定结果符合分析要求。非线性放大还可应用于以dE/dt~E示波图的扩张或收缩来指示滴定终点的示波极谱滴定法及以荧光电位线的伸长或收缩来指示滴定终点的示波电位滴定法,以提高终点变化的敏锐性。以亚硝酸钠滴定对氨基苯磺酸为例说明了这一方法的可行性。
When the position of an incision of a depolarizer is near the maximum value of |dE/dt|, the use of this incision on antilg (dE/dT)~E curve gives better results. Cd^(2+), Zn^(2+), Co^(2+) and Pb^(2+) were directly titrated with EDTA and its related compounds by this method. The accuracy and precision are quite good. In escillopolarographic titrations using expansion and contraction of dE/dt~E curves to indicate the end-point. antilg (dE/dt)~E oscillograms change more greatly than dE/dt~E curves at the end-point. In oscillo-graphic potentiometric titrations with two indicator electrodes,antilgE~E curves also give better results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1989年第10期870-874,共5页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金
关键词
示波极谱滴定
示波极谱图
滴定终点
Oscillopolarographic titrations
Oscillo-graphic potentiometric titrations