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前言离子选择电极分析技术以它独特的优点,在分析化学中获得了广泛应用。但由于分析体系中液接电位的漂移,使其准确度受到影响,而且实验时必须严格控制离子强度。离子选择电极互为参比法(简称互参法)正好可弥补这些缺陷。不仅如此,互参法还是一种联测两种离子的电位分析法。互参法自作者1981年提出以来,引起了国内外某些同行的兴趣。最初作者研究了互参法中一次标准添加法的分析原理及离子强度对测量电位的影响。后来欧阳荣添吴国梁等相继作了研究和应用。本文研究了互参法的二次标准添加法的分析原理和实验条件,并重点研究了离子强燮对分析结果的影响。关于二次标准添加法的误差研究报导不多。我们运用误差传递的原理,推出对实验有指导意义的误差公式,给出了获得最好准确度的实验条件。
Introduction Ion-selective electrode analysis has gained wide applications in analytical chemistry for its unique advantages. However, due to drift of the liquid junction potential in the analytical system, the accuracy is affected, and the ion intensity must be strictly controlled during the experiment. Ion-selective electrode mutual reference method (referred to as cross-reference method) just to make up for these shortcomings. Not only that, cross-reference method is a combination of two ion potential measurement. Mutual legal since the author proposed in 1981, has attracted some domestic and foreign counterparts interest. The original authors studied the principle of analysis of a standard addition method in the cross-reference method and the effect of ionic strength on the measurement potential. Later, Ouyang Rongtian Timothy Wu made research and application in succession. In this paper, the analytical principle and experimental conditions of the quadratic standard addition method of the cross-reference method are studied, and the effect of the strong ion supination on the analytical results is mainly studied. There are not many reports on the error of quadratic standard addition method. Using the principle of error transfer, we introduce the error formula that is instructive to the experiment and give the experimental conditions for obtaining the best accuracy.