Investigation of the effect of laser- parameters on the improvement of the signal of spectral analysis lines of heavy metals in the crude oil by using LIPS - System

In this work, we study effect a laser-parameters on the properties of spectral lines generated from crude oil-plasma by using laser induced plasma spectroscopy. LIPS-Technique is a novel technique for elemental analysis based on the unique spectral signature by laser generated plasma. In this system, laser pulses are applied for generating of the crude oil-plasma in air through focusing a Nd: YAG laser at wavelength 1064 nm and pulse duration 10 ns on test sample to study the capability of (LIPS) as a rapid tool for metals analysis presented in Iraqi crude oil extracted from south field. Optimal laser - parameters of laser-energy (E) and pulse prepetition rate (P.P. R) were evaluated for improving the properties of reference analytic lines (I, T) of GRL and the internal reference lines of iron, nickel and vanadium analytic lines. The analytic lines properties have also been studied for the 606.09 nm wavelength as global reference line for all plasma spectrum (all analytic lines) and the 689.87, 662.4 and 607.31 nm wavelengths as reference line for each Fe, Ni and V metal responsibility. The measured values of the global reference and internal reference lines properties (signal intensity I and Stimulation temperature T) were enhanced values. The optimum obtained results indicated that the LIPS performance is rapid and active method to control on the spectral analytic lines properties and identify the all metals presented in the crude oil.