Rapid Determination of Icing Inhibitor (Ethyl Glycol) in Aviation Fuel by Near-infrared Spectroscopy

摘要

A method for determination of ethyl glycol in aviation fuel by near-infrared spectroscopy is presented. The near-infrared signal of ethyl glycol was analyzed and the wavelength range from 960 to 980 nm and a signal processing method were chosen. A calibration model for ethyl glycol was established by partial least squares regression. The calibration model was satisfactory with parameters of R~2 = 0.9719, predictive residual error sum of squares equal to 0.007, and standard error of calibration equal to 0.010 percent. Statistical t-tests (alpha = 0.05) verified that there was no significant difference between the near-infrared model and the reference method using refraction analysis according to ASTM D5006. Repeatability testing showed that the near-infrared model has precision equivalent to that of the reference method. The study indicates that near-infrared spectroscopy represents a simpler, more rapid, and highly effective test for ethyl glycol in aviation fuel than conventional quantitative analysis.