Determination of Cu, Mn, Ni and Sn in gasoline by electrothermal vaporization inductively coupled plasma mass spectrometry, and emulsion sample introduction☆

摘要: Trace metals in fuels, except the case of additives, are usually undesirable and normally they occur very low concentrations gasoline, requiring sensitive techniques for their determination. Coupling electrothermal vaporization with inductively coupled plasma mass spectrometry minimizes problems related to introduction organic solvents into plasma. Furthermore, sample preparation as oil-in-water emulsions reduces gasoline analysis. In this work, a method determination Cu, Mn, Ni Sn is proposed. Samples were prepared by forming 10-fold diluted emulsion surfactant (Triton X-100), after treatment concentrated HNO3. The was pre-concentrated graphite tube repeated pipetting drying. External calibration used aqueous standards purified emulsion. Six samples from different gas stations analyzed, analyte found be μg l−1 range or below. limits detection 0.22, 0.02, 0.38 0.03 Sn, respectively. accuracy estimated using recovery test.