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The emitted light was measured at a number of different wavelengths and chromatograms reconstructed
from carbon and silicon emission. The optimum emission wavelength for measuring silicon was found
to be 251.6 nm. An example of the separation of a pair of silicon compounds, monitored by atomic
emission, using the ICP torch is shown in Figure 6.19. It is seen that the combination provides good
resolution, a high sensitivity and an extremely selective response. The use of the emission spectrometer
in a tandem combination with the gas chromatograph, is becoming more and more common for the
detection and measurement of trace metals. Nevertheless, the atomic spectrometer appears to be equally
popular for use in tandem with the liquid chromatograph, where it is important in environmental and
toxicology studies.
Figure 6.19
The Separation of Two Tetrasiloxanes
Monitored by Atomic Emission
Employing an ICP Torch
Reprinted with permission from K. A.
Forbes, J. F. Vecchiarelli and P. C.
Uden, Anal. Chem., 62(18)(1990)2033,
Copyright 1990 American Chemical Society
Synopsis
There are three types of analyses in which the GC/AS system is most often employed. The most
important is to provide elemental analysis of the
