Page 259 - Tandem Techniques
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blank run indicates a signal to noise ratio of at least 8 and consequently, the lower sensitivity limit
would appear to be about 200 pg/l.
Microwave induced plasmas suffer from certain drawbacks, one being the easy manner in which the
plasma can become extinguished in the presence of excess organic material. This plasma quenching
often occurs in tandem systems as a result of the elution of the solvent peak from the gas
chromatograph.
Figure 6.12
The Analysis of Five Halogenated Aromatic Compounds by Gas Chromatography/
Capacity-Coupled Microwave Plasma Atomic Emission Spectrometer (ref. 12)
To obviate this problem Winefordner et al [12] developed the capacity coupled microwave plasma
employing a tubular electrode, and obtained a
