Determinatin of nickel and vanadium in residue oil by laser-induced breakdown spectroscopy combined with partial least squares
The rapid analysis of metal elements in residue oil is of great significance for the product quality of residue oil and the efficiency of refining process.Different residue oil samples were obtained from a refin-ery,calcined and ground into powder,and mixed according to different mass ratios to obtain residue oil samples.In this study,the laser-induced breakdown spectroscopy(LIBS)was combined with chemometrics to establish a rapid quantitative method for the analysis of nickel(Ni)and vanadium(V)in residue oil.Firstly,the partial least squares(PLS)model for the quantitative analysis of Ni and V in residue oil was constructed based on the LIBS spectra of 20 different samples.Secondly,the effects of different preprocess-ing and variable selection methods on the prediction performance of PLS calibration model were investiga-ted.The results showed that for Ni and V in residue oil,the PLS model based on first derivative-multiplica-tive scatter correction and synergetic interval PLS(D1st-MSC-siPLS)and PLS model based on second de-rivative-multiplicative scatter correction and synergetic interval PLS(D2nd-MSC-siPLS)had the optimal prediction results.The optimal determination coefficients(Rp)were 0.986 4 and 0.981 2,and root mean square errors(RMSEp)were 1.440 2 and 0.588 8 mg/kg,and the mean relative errors(MREp)were 3.89％and 1.85％,respectively.Therefore,the combination of LIBS technique with PLS algorithm could provide a feasible method for the quantitative analysis of Ni and V elements in reside oil.
laser-induced breakdown spectroscopy(LIBS)partial least square(PLS)variable selectionre-side oilnickelvanadium
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