Naptha refers to light and highly volatile oil fractions used for petrol production and as a precursor for many basic chemicals. Analysis of elemental impurities by ICP-OES is part of the quality control of naptha since Pb, P or Si, for example, can act as a poison to cracking catalysts. As and Cd are of environmental concern. Traditionally kerosene dilution and radial viewing have been used to deal with the plasma instabilities and unspecific carbon based interferences.
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