空白值大小对化学分析精密度的影响是分析工作者很关心的问题,特別是对微量分析更是不容忽视的。对这个问題,国內曾有报导,但文章中的计算公式似较复杂,且有值得商榷之处,特別是对测定次数n的处理,我们有不同的看法。求成分含量的分析誤差时,查Student函数值所用的自由度,我们认为应该用 The effect of blank value on the chemical analysis precision is a concern of the analytical workers, especially for the trace analysis. There have been reports on this issue in China. However, the formulas in the article seem rather complicated and have some problems to be discussed. In particular, we have different opinions on the number of tests n. To find out the analytical error of the content of ingredients, check the degree of freedom used by the value of the Student function, we think it should be used