Inductively Coupled Plasmas as Atomization Cells for Atomic Fluorescence Spectrometry

Inductively coupled plasmas (ICP) offer promise as atomization cells for atomic fluorescence spectrometry (AFS). In this study, an ICP formed part of a modular spectroscopic system for atomic fluorescence, emission, and absorption measurements. Details on the assembly of the complete system are provided. Mlcrowave-excited, thermostated, electrodeless dlscharge lamps were used as prlmary sources for excltlng the atomic fluorescence. A minicomputer provided control of radiofrequency (RF) forward power and site of observation in the plasma, as well as data acquisition and processing. The effects of important variables on the plasma background, the atomic fluorescence signal, and signal-to-noise ratlo were examined. Scattering and matrix effects were also evaluated. The atomic fluorescence powers of detection for Cd, Zn, and Hg were found to be superior to those observed in emlssion when the same experimental facilities were used for the measurements.