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- Mass Spec Tips1 - Freon for use in Mass Spectrometer Leak Checking 2 - Mass Spectrometer Probe Cooling 3 - Sample Vials for Direct Probes 4 - Selection of Vacuum Pump Oils for Lowest Mass Spec Background 5 - Determination Linkages in Biomolecules of Disulfide 6 - Transfer of H.P. ChemStation MS and GC Chromatograms from PC to MAC Computer 7 - Repairing Clogged Thermospray Probes 8 - Tuning a Finnigan 5100 to Meet BFB or DFTPP Criteria 9 - H.P. 5971 Transfer Line Tip for Direct Introduction of Capillary Column 10 - Troubleshooting Finnigan 5100 GC/MS Systems 11 - Leak Checking Mass Spectrometers 12 - Elimination of Memory Peaks and GC Background Noise 13 - SuperIncos Mapped Software Print Buffer Lockup 14 - Reduction of Peak Tailing 15 - Electron Multiplier Sensitivity 16 - INCOS Procedure for Calibrating on the Finnigan 4500 17 - Extending Electron Multiplier Life 18 - What techniques or methods do you use to determine if the electron multiplier 19- What techniques or methods do you use to detect vacuum leaks in your mass spectrometer 20 - Extending Lenear Range of the Mass Spec Article - Improving Sensitivity in the HP 5971 Mass Spectrometer - Part 1 and Part 2
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- 3 - Sample Vials for Direct Probes (This Page)
Mass Spec Tips is a collection of tips relating to the operation
and service of mass spectrometers. Some of these Tips have been
reported in our newsletter, "The Mass Spec Source."
If you have a question relating to the operation or service of
mass spectrometers or would like to add your comments to the below
tip and would like to have it included in this forum, please contact us.
Input to this database of MS Tips is needed from our readers
to complete this section.
Author: Christopher Baker
Affiliation: Scientific Instrument Services
Sample vials for use in direct probes have been made of a variety of materials including aluminum, gold, quartz and Pyrex glass. Quartz, gold and aluminum vials are fairly expensive and therefore many users elect to reuse the vials after cleaning between samples. This is time consuming and care must be taken to insure that the vials are completely clean to eliminate cross contamination.
Glass has been widely used for sample vials because the vials are inexpensive enough to make them disposable. The glass vials, however, can be difficult to use because they are fragile and are susceptible to breaking when inserting or removing the vials from the probe. The small diameters of straight sample vials also makes loading a sample troublesome.
Flared glass sample vials provide advantages over the standard straight glass sample vials. The flared end of the vial makes loading a liquid sample much easier since the flare helps guide the syringe needle into the vial. The flared end also makes the vial much stronger so that vials can easily be inserted and removed from the end of the probe using tweezers without breaking the glass. Flared vials have been used on most Finnigan MAT instruments for many years, however flared vials of various diameters can be manufactured by S.I.S. for use on other instruments providing glass sample vials which are stronger and make sample loading much easier.