Direct analysis of analyte–laden chromatographic stationary phase by induction–heating electrothermal vaporizer with inductively coupled plasma atomic emission spectroscopy

Abstract

We describe the inductively heated electrothermal vaporization of 8-hydroxyquinolate complexes of Cd, Pb, and Zn adsorbed onto C18-bonded silica gel with inductively coupled plasma atomic emission spectroscopic detection. The metal complexes were adsorbed onto the chromatographic stationary phase using a solid-phase extraction procedure. Instead of eluting the complexes from the stationary phase, the solid phase was directly vaporized into the plasma. Absolute detection limits for this method ranged from 0.3 to 3 µg.Key words: 8-hydroxyquinoline, silica gel, induction heating electrothermal vaporization, inductively coupled plasma atomic emission spectroscopy.