Clustering Analysis of Gasoline Based on the 3-Dimensional Fluorescence Characteristic

Fluorescence characteristic of samples of pure 90#,93# and 97# gasoline as well as their intermixtures were studied by the 3-dimensional fluorescence spectrometry.The data obtained in the range of λem from 340 nm to 500 nm with λex at 330 nm were studied by principle component clustering analysis.It was found from the result that the fluorescence data were classified into 3 groups: gasoline samples with grade 90# were located in the 1st quadrant;samples with grade 97# in the 3rd quadrant;and samples with grade 93# in the 4th quadrant.In the 1st and 4th quadrant,the spectral data were subdivided into 2 groups,giving spectra of pure sample and samples of intermixtures.Hence,it was easy to differentiate grades of gasoline and pure gasoline from the intermixtures by the results of clustering analysis.Furthermore,based on the distances between locations of experimental sites of pure sample and intermixture sample,the amount of blended component could be deduced.