在測定純物质中微量杂质成分时,常常会遇到这样情况:一些化学反应或測定方法的灵敏度往往由于实际操作中存在的干扰因素而大大受到限制。例如灵敏度能測定至1/10或1/100微克的方法,在作試样分析时,往往只能用来定出微克级的杂质成分。大家知道,干扰因素中最严重的也就是經常所不能避免的“空 In the determination of trace impurities in pure substances, often encounter such a situation: the sensitivity of some chemical reactions or determination methods often due to the actual operation of the interference factors are greatly limited. For example, the sensitivity can be measured to 1/10 or 1/100 micrograms of the method used in the analysis of the sample, often only used to determine the micrograms of impurities. As we all know, the most serious of the disturbing factors are often “unavoidable”