检出限几种常见计算方法的分析和比较

Comparison of Several Calculation Methods of Detection Limit

建立极差法计算仪器检出限的相关方法,与贝塞尔公式法进行比较,数据表明两种方法对检出限的计算结果一致。提出极差系数可通过C≈1.1227ln(n)+0.4708(n≤20)近似得到。从极差角度对影响检出限测量的若干问题进行探讨更易于理解和掌握,如杂质含量高的纯溶液或纯铁对检出限的影响等,同时极差法具有快速、简便的特点。相关探讨可为类似的检出限计算提供参考和依据。

Calculation for detection limit（DID of instruments by range method is coincided with those by Bessel formula method. Coefficient of range method can be estimated by the following formula. C≈ 1. 1227ln （n） ＋ 0. 4708 （n≤ 20）. Some problems can be reanalyzed and comprehended more easily by range method. For instance, the effect was tested by blank sample or high-purity iron on detection limit. The method is fast,convenient and helpful for similar study.