Page 368 - Multidimensional Chromatography

Multidimensional Chromatography in Environmental Analysis 359

Figure 13.14 LC-diode-array detection (DAD) chromatogram (at 220 nm) obtained after
preconcentration of 50 ml of ground water sample spiked with various pollutants at levels of
3 g l 1 passed through (a) a PLRP-S cartridge and (b) an anti-isoproturon cartridge. Peak
identification is as follows: 1, chlortoluron; 2, isoproturon plus diuron; 3, linuron; 4, diben-
zuron; *, water matrix. Reprinted from Journal of Chromatography, A 777, I. Ferrer et al.
‘Automated sample preparation with extraction columns by means of anti-isoproturon
immunosorbents for the determination of phenylurea herbicides in water followed by liquid
chromatography diode array detection and liquid chromatography–atmospheric pressure
chemical ionization mass spectrometry’, pp. 91–98, copyright 1997, with permission from
Elsevier Science.

if a retention gap is used. The techniques developed for this can also be used to
transfer relevant fractions from an LC–column and this has been extremely impor-
tant in developing LC–GC methods for environmental trace analysis.