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The Saturn is used for both qualitative (identification/confirmation)
and quantitative determinations of trace levels of organic compounds and is
capable of both electron ionization (EI) and chemical ionization (CI) using
liquid reagents in either MS or MS/MS modes. Selective Ion Storage (SIS)
can be used to isolate one or more specific ions in the presence of a much
higher background. MS/MS (tandem MS) enables selective storage and
subsequent fragmentation of a precursor ion and can be used to further
eliminate background and/or to differentiate analytes with very similar
GCMS spectra. The NIST 2003 library is available for spectral searches.
Detection limits depend on the mass range under consideration, but
femtogram levels are reported possible. Separation and detection limits are
affected by the boiling point of the sample (up to 350 C) and the mass of
the analyte (permissible range: 10 - 650 amu).
The Combi-Pal autosampler is available for automated liquid, heated
headspace, or Solid Phase Micro Extraction (SPME) injections into the 1077
split/splitless injector. Capillary columns that we own include: SPB1 (30m
X 0.25mm, 1uM film), DB5-MS (30m X 0.25mm, 0.25uM film), DB624 (60m X
0.32mm, 1.8uM film) and SP2380 (30m X 0.25mm, 0.20uM film).
Samples to be injected directly into the GC must be either gasses or
particle-free organic liquids. Typical solvents include hexane, methanol,
and methylene chloride. The autosampler can accommodate a wide range of
vials, but 2mL (liquid injections) and 20 mL (headspace/SPME) are the most
typical. Vial inserts allow samples volumes of as little as ~25 uL.
For more instrument specifications visit Varian’s website HERE. Contact GEL staff to discuss your application
needs in more detail.
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