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An infrared spectroscopic method for quantitative analysis of fatty alcohols and fatty acid esters in machinery oils

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Abstract

A new infrared spectroscopic method suitable for determining total fatty alcohol and fatty acid ester concentrations in industrial oils has been developed. Oil samples were diluted with toluene (1:3 w/w), the toxicity and volatility of which are relatively low compared with more commonly used IR solvents, like carbon tetrachloride or carbon disulfide. Mixture standards were prepared from dodecanol, tetradecanol, octadecanol, methyl stearate and methyl palmitate. Some analytical and statistical tests were performed on the developed method. The recoveries and the repeatability of the method proved to be sufficient for the quantitative determination of fatty alcohol and fatty acid ester additives in industrial oils. Reproducibility testing in another laboratory also produced satisfactory results. The developed method also proved to be relatively quick and simple. This method was developed to satisfy industry’s need to determine the concentrations of these oil additives, and it has already been applied successfully in machinery oil analysis.

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Acknowledgements

Mrs. Päivi Joensuu is acknowledged for carrying out the GC-MS measurements. M.Sc.(Chem.) Pirkko Kekarainen is acknowledged for the opportunity to carry out comparison measurements at Oulu Polytechnic, Institute of Technology. The Finnish Maintenance Society and the Tauno Tönning Foundation are acknowledged by Pekka Vähäoja for their financial support.

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Authors and Affiliations

  1. Department of Chemistry, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland

    Pekka Vähäoja, Jani Närhi, Toivo Kuokkanen & Jorma Jalonen

  2. Oulu Polytechnic, Institute of Technology, Kotkantie 1, 90250, Oulu, Finland

    Outi Naatus

  3. Department of Mechanical Engineering, University of Oulu, P.O. Box 4200, 90014, Oulu, Finland

    Sulo Lahdelma

Authors
  1. Pekka Vähäoja
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  2. Jani Närhi
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  3. Toivo Kuokkanen
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  4. Outi Naatus
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  5. Jorma Jalonen
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  6. Sulo Lahdelma
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Correspondence to Pekka Vähäoja.

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Vähäoja, P., Närhi, J., Kuokkanen, T. et al. An infrared spectroscopic method for quantitative analysis of fatty alcohols and fatty acid esters in machinery oils. Anal Bioanal Chem 383, 305–311 (2005). https://doi.org/10.1007/s00216-005-3405-z

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  • DOI: https://doi.org/10.1007/s00216-005-3405-z

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