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A Comparative Study of Calibration Transfer Methods for Determination of Gasoline Quality Parameters in Three Different Near Infrared Spectrometers

A Comparative Study of Calibration Transfer Methods for Determination of Gasoline Quality Parameters in Three Different Near Infrared Spectrometers

Claudete Fernandes Pereira, Maria Fernanda Pimentel, Roberto Kawakami Harrop Galvão, Fernanda Araújo Honorato, Luiz Stragevitch, Marcelo Nascimento Martins

Anal Chim Acta. 2008 Mar 17;611(1):41-7.

PMID: 18298965

Abstract:

This work presents a comparative study of calibration transfer among three near infrared spectrometers for determination of naphthenes and RON (Research Octane Number) in gasoline. Seven transfer methods are compared: direct standardization (DS), piecewise direct standardization (PDS), orthogonal signal correction (OSC), reverse standardization (RS), piecewise reverse standardization (PRS), slope and bias correction (SBC) and model updating (MU). Two pre-treatment procedures, namely standard normal variate (SNV) and multiplicative scatter correction (MSC), are also investigated. The choice of an appropriate number of transfer samples for each technique, as well as the effect of window size in PDS/PRS and OSC components, are discussed. A broad set of gasoline samples representative of the Northeastern states of Brazil is employed in the investigation. The results show that the use of calibration transfer yields prediction errors comparable to those obtained with complete recalibration of the secondary instrument. Overall, the results point to RS as the best method for the analytical problem under consideration. When storage and/or physical transportation of transfer samples are impractical, MU is more appropriate. The comprehensive investigation carried out in the present work will be of value for practitioners involved in networks of fuel monitoring.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS212797	Research Octane Number Standard			Price

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