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Los precios y características de
los productos que aparecen en este sitio pueden variar sin previo aviso
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 | Inject Larger
Volumes onto Narrow Bore Columns |
| Concentrate Sample
and Focus Peaks |
| Less Bulky than
Conventional PTVs |
| Simpler than Split/Splitless
Injectors |
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Great for Semivolatile Samples |
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The On-Column
PTV injector is a resistively heated precolumn, which is
connected to your narrow bore column with a special,
electrically insulated split "T" inside the GC column oven. The
5 micron nonpolar phase in the OCPTV precolumn has a high
capacity to absorb high boiling compounds, and is stable at high
temperatures. Like in-tube SPME, the precolumn discriminates in
favor of high boiling semivolatile analytes, concentrating them
in the phase. Like the heated split/splitless injector, the
OCPTV vents the solvent without expanding it to a gas. Therefore,
the OCPTV is capable of larger liquid injections than a regular
heated split/splitless injector. |
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| The
GC operator injects sample via syringe through the on-column injection
port with the split vent open to vent the solvent. After injection and
solvent venting, the precolumn heats up while the carrier gas flows
through it to sweep focused analytes from the precolumn to the
analytical column. At this point, the precolumn is hotter than the
column oven. The temperature difference between the hotter precolumn and
cooler analytical column causes the analytes to focus on the analytical
column, resulting in sharp peaks on the chromatogram. |
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I C O N
A R G E N T I N A IyE