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首页> 外文期刊>Journal of analytical chemistry >Estimation of limits of detection and determination in X-ray fluorescence analysis by the dependence of the relative standard deviation on analyte concentration
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Estimation of limits of detection and determination in X-ray fluorescence analysis by the dependence of the relative standard deviation on analyte concentration

机译：通过相对标准偏差对分析物浓度的依赖性估算X射线荧光分析中的检测和测定极限

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摘要

An experimental dependence of the relative standard deviation on analyte concentration of hyperbolic type, characterizing the precision of quantitative chemical analysis, was used to estimate the limits of detection and determination in the X-ray fluorescence analysis. A method is proposed for the determination of their values using the approximation of the experimental dependence of the relative standard deviation on the analyte concentration by a power function. The choice of the values of the relative standard deviation, being criteria for the estimation of these limits, is substantiated. A concept of the limits of detection and determination of an analytical procedure is formulated, according to which the limit of detection of an analytical procedure is an objective value depending only on the precision of determinations, and the limit of determination of an analytical procedure is a subjective value depending not only on the precision of determinations but also on the requirements to their limiting (admissible) accuracy. The limits of detection and determinations of an analytical procedure found by this approach completely characterize the possibilities of an analytical procedure in determining low concentrations of analytes. The proposed approach can be used for the estimation of the limits of detection and determination of analytical procedures and in other methods of chemical analysis with the hyperbolic dependence of the relative standard deviation on the analyte concentration.
机译：相对标准偏差对双曲线型分析物浓度的实验依赖性，表征了定量化学分析的精度，被用于估计X射线荧光分析中检测和测定的极限。提出了一种方法，该方法使用幂函数通过相对标准偏差对分析物浓度的实验依赖性的近似值来确定其值。证实了相对标准偏差值的选择，这些标准值是这些极限的估算标准。提出了分析程序的检测和确定极限的概念，根据该概念，分析程序的检测极限是仅取决于确定精度的目标值，而分析程序的确定极限是目标值。主观价值不仅取决于确定的精度，还取决于对限制（允许）精度的要求。用这种方法发现的分析方法的检测和测定极限完全表征了在确定低浓度分析物时分析方法的可能性。所提出的方法可用于估计检测限和确定分析程序，以及用于相对标准偏差对分析物浓度呈双曲线依赖性的其他化学分析方法。

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