Analysis of Trace Metal Elements in Residual Oils Through Extraction Induced by Emulsion Breaking and ICP-MS/MS
A new strategy for determination of multiple metal elements in residual oils using inductively coupled plasma tandem mass spectrometry(ICP-MS/MS)was proposed based on extraction induced by emulsion breaking(EIEB).The residual oil sample was diluted with xylene to reduce the viscosity,emulsified by Triton X-114 with the mass fraction of 6％,demulsified in ultrasonic water bath for 25 mins;metal elements were extracted from the residual oil into aqueous phase using hydrochloric acid with the volume fraction of 40％.;the contents of 10 metal elements including Na,Mg,Al,Ca,V,Cr,Fe,Ni,Cu,and Zn were determined by ICP-MS/MS.The effect of EIEB conditions on the extraction efficiency of metal elements in residual oils was evaluated in details.In the MS/MS mode,He collision gas or different reaction gases were used to eliminate the spectral interference of metal elements.Moreover,the standard reference materials NIST SRM 1634c(trace elements in fuel oil)was used to evaluate the accuracy of the method.The residual oil samples were processed by microwave digestion and the comparative analysis of results were performed by sector field inductively coupled plasma mass spectrometry(SF-ICP-MS),so as to verify the reliability of the method.The results reveal that the metal elements show a good linear relationship in their respective concentration ranges(with the linearly dependent coefficient no less than 0.9997),the limit of detection(LOD)is 2.05-31.4 ng/L,the determination results of NIST SRM 1634c are basically consistent with the certified values provided by standard reference materials and the reference values reported in literature,the confidence level is 95％,and there is no significant difference in the comparative analysis results of ICP-MS/MS and SF-ICP-MS.ICP-MS/MS has the advantages of simple operation,fast analysis speed,good accuracy and reliability,and has been used for quality evaluation of metal elements in residual oil.
residual oilinductively coupled plasma tandem mass spectrometry(ICP-MS/MS)metal elementextraction induced by emulsion breakingspectral interference
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