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Evaluation of the Effect of Wavelength Positioning Errors on Kalman Filtering Results in Inductively Coupled Plasma Atomic Emission Spectrometry

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This work evaluates the effect of wavelength positioning errors in spectral scans on analytical results when the Kalman filtering technique is used for the correction of line interferences in inductively coupled plasma atomic emission spectrometry (ICP-AES). The results show that a positicning accuracy of 0.1 pm is required in order to obtain accurate and precise estimates for analyte concentrations. The positioning error in sample scans is more crucial than that in model scans. The relative bias in measured analyte concentration originating from a positioning error in a sample scan increases linearly with an increase in the magnitude of the error and the peak distance of the overlapping lines, but is inversely proportional to the signal-to-background ratio. By the use of an optimization procedure for the positions of scans with the innovations number as the criterion, the wavelength positioning error can be reduced and, correspondingly, the accuracy and precision of analytical results improved.

Keywords: Atomic emission spectrometry; Inductively coupled plasma; Kalman filtering; Wavelength positioning errors

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702924123377

Affiliations: Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.R. China

Publication date: December 1, 1992

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