Determination of Total Alkalinity of Motor Oil by FTIR Spectroscopy
Department of Transport Means and Diagnostics, University of Pardubice, Czech Republic
The article presents methods of determination of total alkalinity of motor oils by FTIR spectroscopy using PLS and PCR chemometric algorithms. The PLS algorithm, applied to the visible spectra (1764-1520 cm1) proved to be the most suitable algorithm in predicting TBN (total base number) values. The main advantage of the PLS model for determination of TBN (compared with potentio¬metric titration) is its rapidity and minimum consumption of chemicals. The FTIR-PLS models must be supplemen¬ted by new standards at certain time intervals due to lubricant and batch differences within the same type of oil.
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