Standard additions: myth and reality

被引:139
作者
Ellison, Stephen L. R. [1 ]
Thompson, Michael [2 ]
机构
[1] LGC Ltd, Teddington TW11 0LY, Middx, England
[2] Univ London Birkbeck Coll, Sch Biol & Chem Sci, London WC1E 7HX, England
关键词
D O I
10.1039/b717660k
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Standard additions is a calibration technique devised to eliminate rotational matrix effects in analytical measurement. Although the technique is presented in almost every textbook of analytical chemistry, its behaviour in practice is not well documented and is prone to attract misleading accounts. The most important limitation is that the method cannot deal with translational matrix effects, which need to be handled separately. In addition, because the method involves extrapolation from known data, the method is often regarded as less precise than external calibration ( interpolation) techniques. Here, using a generalised model of an analytical system, we look at the behaviour of the method of standard additions under a range of conditions, and find that, if executed optimally, there is no noteworthy loss of precision.
引用
收藏
页码:992 / 997
页数:6
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