The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 11
Issue 6 (2006) pp 394-401
Precision in Multi-Wavelength Spectroscopic Analysis with Classical-Least-Squares Regression
Miguel A. Cabezón and Alejandro C. Olivieri
Departamento de Química Analítica, Facultad de Ciencias
Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha
531, Rosario (S2002LRK), Argentina, email@example.com.
Published online: 24 October 2006
Abstract. The determination of the concentrations of several analytes in a sample by measuring its absorbance at many different wavelengths is reviewed, with specific emphasis on prediction uncertainty. The standard concentration error can be estimated by an equation resembling the well-known expression for the univariate case. Spectra for aqueous mixtures of potassium permanganate and potassium dichromate at a suitable pH are studied, and the concentrations are calculated including the proper uncertainty estimates.
Key Words: Laboratories and Demonstrations; analytical chemistry; analytical spectroscopy; multi-wavelength regression; uncertainty estimation; error propagation
(*) Corresponding author. (E-mail: firstname.lastname@example.org)
Issue date: December