Salting-out
Cartridge -SPE
Membrane -SPE
Figure 6. LC18 RP-HPLC chromatograms for
sample 30 preconcentrated using SOE, SPE-C,
and SPE-M with new manufacturer-cleaned SPE
0
4
8
12
16
SPE-C and SPE-M.
Retention Time (min)
Salting-out
Cartridge-SPE
Membrane-SPE
Figure 7. LC-CN RP-HPLC chromatograms
for sample 30 preconcentrated using SOE,
SPE-C, and SPE-M with new manufacturer-
cleaned SPE materials showing small RDX
0
4
8
12
16
Retention Time (min)
9
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