Page 449 - Tandem Techniques
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AA in this way was extended to laser excited atomic fluorescence, which was originally employed for
measuring organic tin and manganese compounds eluted from an LC column. Sensitivities ranged down
to 60 pg of the metallic element. The graphite furnace has also been used as an interface between the
liquid chromatograph and the atomic spectrometer, but requires a specially fabricated thermo sample
injector. The sensitivity of the system to tin was about 0.5-1.0 ng per peak. The atomic spectrometer
has also been interfaced to a liquid chromatograph by a transport device involving a rotating wheel. The
eluent from the column was sprayed on the perimeter surface of a rotating wheel and the solvent
evaporated. The wheel rotated and placed the sample into a microwave induced plasma, where the
element was ionized and measured in the usual manner. The sensitivity varied widely between different
elements, but was of the order of about 10 ng of sample.
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