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• W2740058831 abstract "(2) where Aan and f(x)are statistical estimates of the analytical parameter Aan depending on the analytical signal and the calibration dependence f(x). Equation (2) is a generalized form of the basic QAESA equation. It is useful to consider the basic characteristics of QAESA from the perspective of analyzing this equation. Its lefthand side is the experimental (and, where necessary, mathematically transformed) analytical signal from the element being determined in the analytical sample, i.e., in fact, the analytical parameter used in the calculations and the construction of the calibration curve. The right-hand side is a mathematical model of the dependence of the analytical parameter for the element in the samples on the content of this element. In practice, this model is usually constructed not using samples but using comparison samples, the qualitative and quantitative composition of which must be identical to the composition of the samples being analyzed with identical analytical conditions. It is assumed here that the mean values of the analytical parameters and their dispersion are equal both for the samples being analyzed and for the comparison samples if the content of the desired element in the sample and the comparison sample is the same, i.e., that the left-hand and right-hand sides in Eq. (2) are equal. Thus, if Eq. (2) is in fact invalid anywhere in its region of application, the corresponding systematic error appears; three basic reasons for the appearance of such an error characterizing the correctness of the method may be stated: the difference in physicochemical properties of different samples and comparison samples, leading to different values of the analytical parameter and its dispersion with the same content of the element being determined in the sample and the comparison sample; the influence of interfering elements which are present in some samples, but not in other samples or comparison samples, on the analytical parameter; the disagreement between the mathematical model constructed or the calibration curve and the actual physical relation between the analytical parameter and the content of the element x. The random error characterizing the reproducibility of the analysis in the given method depends on statistically distributed random values on both the left- and right-hand sides. Thus, the random error depends on the form of the statistical distribution, the number of measurements and comparison samples, their content, etc. The QAESA method may be regarded as having been developed if the following are established: a) the optimal physicotechnical conditions of analysis; b) the method of determining the specific graphical or mathematical form of Eq. (2) and the range of contents {Xmin, Xmax}" @default.
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• W2740058831 date "1990-01-01" @default.
• W2740058831 modified "2023-09-27" @default.
• W2740058831 title "OF SPECTRAL ANALYSIS" @default.
• W2740058831 hasPublicationYear "1990" @default.
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