Determination of 8 Harmful Elements in Gasoline by ICP-AES Using Microconcentric Nebulizing System

Isooctane, a solvent with similar carbon number in the carbon chain to that of the gasoline, was selected as the diluent for gasoline in the mass ratio of 1 to 1, and the diluted gasoline sample was introduced into the highly efficient nebulizing system. Eight harmful elements (Pb, Fe, Mn, Cu, P, S, Cl and Si) in the nebulized sample were then determined by ICP-AES under the optimized conditions of the instrument. Linear relationships between the values of analytical signals and mass fraction of the 8 elements were found in definite ranges, with detection limits (3s) in the range of 0.34-250 μg·kg^-1. Values of recovery found by standard addition method were in the range of 94.4%-108%, and values of RSDs (n=7) found were ranged from 1.1% to 4.9%.