solid-phase extraction mode. After the transfer step, eluate in the
transfer line is discharged with the helium, preventing its
evaporation during analysis and its entrance into the GC column.
The solvent peak obtained after transfer cannot be observed in
the GC chromatograms (see Figure 6); hence, solvent elimination
is complete. It should be noted that it is possible to employ an
Figure 6.Gas chromatograms of real-water samples from the Ebro
River analyzed by off-line SPE and on-line RPLC-GC: (a) atrazine
analysis; (b) phenthoate analysis; (c) parathion analysis; (d) diazinon
and fenthion analysis.