A versatile calibration scheme for the analysis of petroleum products with ICP-AES
- Varian Associates, Palo Alto, CA (United States)
- Varian Optical Spectroscopy Instruments, Wood Dale, IL (United States)
The direct determination of trace metals in volatile organic solvents and petroliferous materials is problematic due to interference effects in the sample introduction system and in the plasma. As a result of high loading of the organic aerosols and vapors, their incomplete pyrolysis results in the formation of carbon in the torch components and occurrence deleterious spectral interferences due to prominent C-molecular bands. In addition to these factors, accurate determination can only be obtained if the variable viscosity of the diluents, the sample constituents and the standards are accurately matrix matched. In this presentation, the authors will detail several procedures designed to minimize these effects-spray chamber cooling, oxygen bleeding, tetralin dilution, Triton-X-100 emulsification, and selective removal of the organic matrix by membrane separation and thermal desolvation. Using scandium as the internal reference, data for a wide range of standard reference materials varying from gasoline to crude oils will be presented. A critical examination of the various procedures will be made using conventional figures of merit such as limits of detection, calibration universality, precision, accuracy, and convenience of operation.
- OSTI ID:
- 191760
- Report Number(s):
- CONF-941098--
- Country of Publication:
- United States
- Language:
- English
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