Investigation on Oil Spectrum Detection Technology Based on Electrode Internal Standard Method

In order to solve the problem that the internal standard elements cannot be added to the rotating disk electrode (RDE: Rotation disk electrode) oil spectrometer, which leads to the low stability and accuracy of the test results. In this paper, an internal standard detection technique using the components of the electrode itself as the internal standard is proposed. Firstly, the spectrum line of carbon element, which is the main component of the electrode under pulsed arc excitation, is used as the internal standard, and the actual test spectrum data obtained within the standard test time are normalized. Then, according to the internal standard method, the different elements needed to be tested are processed according to the peak-to-bottom ratio method. Finally, the method is applied to the oil analysis spectrometer developed by ourselves. The experimental results show that the test results using the electrode internal standard method are obviously better than those without the electrode internal standard method. The repeatability and reproducibility error of the measured values are within the allowable range of ASTM-D6595, especially the reproducibility and reproducibility of iron, copper, magnesium, aluminum, and so on are better than those of ASTM-D6595 standard. The RSD value is increased by nearly one order of magnitude, which can meet the needs of the actual lubricating oil detection and analysis, and the stability and accuracy are better.