Basic HTML Version
Online PTV Injector for GC - SRI Instruments
On-Column PTV Injector
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Inject larger volumes onto narrow
bore columns
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Concentrate sample and focus peaks
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Less bulky than conventional PTVs
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Simpler than split/splitless injectors
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Great for semivolatile samples
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.
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.
This chromatogram was generated by an
SRI GC equipped with an OCPTV
injector and an FID detector. A 25 meter
narrow bore capillary column was used
to separate 100ppm diesel range
organics (DRO).
8690-0037
OCPTV Injector
$1,539.00