Page 448 - Tandem Techniques

Page 431

Figure 10.19
The Wheel Transport Interface

The authors demonstrated the efficacy of the device by separating a range of different halogen and oxy-
halogen ions. The sensitivity realized varied widely from 4 ng/s for sodium iodide to 300 ng/s for
sodium bromide. These limits of detection do not approach those of ion chromatography, but the system
does offer selective detection, which would allow the halogen peaks of interest to be picked out of a
complex group of coeluting ions containing different elements.

Synopsis

LC/AS techniques are almost exclusively employed in elemental analysis. The different forms of
atomic spectroscopy offer high element sensitivity unambiguous element identification, and can
accommodate samples contained in almost any type of matrix. The early attempts at developing LC/AS
tandem instruments was to couple a standard liquid chromatograph directly to a flame atomic
absorption spectrometer. The use of the flame