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Published on: August 22, 2017
A uniform nonlinearity criterion for rational functions applied to calibration curve and standard addition methods
Anna Maria Michałowska-Kaczmarczyk1, Agustin G Asuero2, Julia Martin2
1Department of Oncology, The University Hospital in Cracow, 31-501 Cracow, Poland.
Abstract:
Rational functions of the Padé type are used for the calibration curve (CCM), and standard addition (SAM) methods purposes. In this paper, the related functions were applied to results obtained from the analyses of (a) nickel with use of FAAS method, (b) potassium according to FAES method, and (c) salicylic acid according to HPLC-MS/MS method. A uniform, integral criterion of nonlinearity of the curves, obtained according to CCM and SAM, is suggested. This uniformity is based on normalization of the approximating functions within the frames of a unit area.
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