极弱酸阴离子的不完全抑制电导检测离子色谱法

提出了一种新颖的用于测定极弱酸根阴离子的电导检测方法──不完全抑制电导法。从原理上分别与抑制电导法和非抑制电导法进行了比较。对亚砷酸硼酸的实验结果表明，不完全抑制电导法的检测限低于非抑制电导法。与抑制电导法相比，检测灵敏度有较大提高，对于250mg／L的硼酸，峰面积和峰高信号分别增大了1002倍和261倍。

The Determination of Anions of Very Weak Acids by incompletely Suppressed Conductometric Detection

A novel method, incompletely suppressed conductometric detection, has been developed for the determination of anions of very weak acids. The principle of the method is discussed. The advantages of the method over the suppressed and nonsupressed methods for the determination of anions of very weak acids are also discussed theoretically. Results showed that the detection limits of the method for arsenous acid and boric acid were lower than those of nonsuppressed conductometric method. Being compared with suppressed conductometric method, the sensitivity was improved greatly. For 250 mg/L boric acid, 261-and 1002-fold increases in peak height and peak area were obtained, respectively. Within the linear range of the detection, the linear correlation coefficients of the peak areas of two weak acids were 0. 999 1 and 0. 998 5, respectively.