近年来,随着高纯材料的发展,对材料中极微量杂质的测定方法研究也越来越重要。金属中微量杂质氮的测定方法主要是惰性气氛熔融—热导法及蒸馏分离—分光光度法。二种方法的测定下限都不足。70年代提出并迅速发展起来的离子色谱法,在公害、食品及医疗领域中用作测定各种离子的常规 In recent years, with the development of high-purity materials, the research on the determination of trace impurities in materials has become more and more important. Determination of trace impurities in metals nitrogen is mainly inert atmosphere melting - thermal conductivity and distillation separation - spectrophotometry. The two methods of determination of the lower limit are not enough. Ion chromatography developed and rapidly developed in the 1970s has been used as a routine measure of various ions in the field of pollution, food and medical applications