Determination of phosphorous in lubricating oil by XRF and NMR methods

XRF 및 NMR 법에 의한 윤활유 중의 인 함량 비교분석 연구

  • Lim, Heon-Sung (Chemical Analysis Laboratory, Korea Research Institute of Chemical Technology) ;
  • Han, Gee-Chung (Chemical Analysis Laboratory, Korea Research Institute of Chemical Technology) ;
  • Lee, Sueg-Geun (Chemical Analysis Laboratory, Korea Research Institute of Chemical Technology)
  • Received : 2005.02.14
  • Accepted : 2005.03.14
  • Published : 2005.04.25

Abstract

A comparison study of XRF and $^{31}P$-NMR method for the analysis of phosphorous in lubricating oil has been described. Pure oil and water were used for the observation of matrices effect variation by different analytical methods. Quantitative analysis was carried out by XRF and $^{31}P$-NMR using real samples. Significant difference is observed from the slopes on the calibration curves by the XRF due to the matrices (water: 124.0, oil: 276.6). While the result obtained from XRF showed a large matrix effect, the slopes obtained from $^{31}P$-NMR results of two different matrices, however, are in good agreement ranged of ${\pm}9%$ (water: 4.9, oil: 5.3).

Keywords

phosphorous in oil;XRF;$^{31}P$-NMR

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