Quantitative analysis of metal elements in crude oil by means of laser induced breakdown spectroscopy

In order to analyze the content of metal elements in crude oil, Na in crude oil after thermal process was quantitatively analyzed by calibration curve for integrated intensity and peak intensity of spectrum respectively by using the technology of laser-induced breakdown spectroscopy. 6 elements were quantitatively analyzed on the basis of Na Ⅰ 588.995nm, Mg Ⅰ 383.230nm, Al Ⅰ 308.215nm, K Ⅰ 404.414nm, Ca Ⅰ 364.441nm, Fe Ⅱ 273.955nm in the experiment. The mass fraction of above 6 elements were 0.0592,0.0029,0.0212,0.0019,0.0072,0.1686 according to calibration curves for element content and integrated intensity, and the linear correlation coefficient and the detection limit of calibration curves were also calculated. It turned out that it is better to choose the integrated intensity for calibration curve. Na is also quantitatively analyzed by using the technology of X-ray fluorescence spectroscope. Compared with the measurement results of laser-induced breakdown spectroscopy and X-ray fluorescence spectroscopy, the relative error is 6.28%. The technology of laser-induced breakdown spectroscopy could be applied to measure the content of metal elements in crude oil.