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Gas reference materials

Direct chemical ionisation mass spectrometry calibration (PTR-MS)

Calibration standards for proton transfer reaction mass spectrometry

Gas standards for calibrating PTR-MS instruments

NPL provides a 20-component gas mixture standard for calibrating the transmission function of Proton Transfer Reaction – Mass Spectrometry (PTR-MS) instruments. The composition of this standard includes the following compounds at nominally 1 μmol/mol within a nitrogen balance gas. The uncertainties for each compound are in the range of 3-10 %.

benzene m-xylene butan-2-one (MEK)
1,2,4-trichlorobenzene dimethyl sulfide (DMS) acetonitrile
1,2,4-trifluorobenzene 3-carene 3-buten-2-one (MVK)
1,2,4-trimethylbenzene isoprene perfluorotributylamine (PFTBA)
hexamethylcyclotrisiloxane (D3-siloxane) methanol toluene
octamethylcyclotetrasiloxane (D4-siloxane) acetone ethanol
decamethylcyclopentasiloxane (D5-siloxane) acetaldehyde  

Note: Common used names are shown here but the preferred IUPAC names where appropriate are: propan-2-one (acetone), (methylsulfanyl) methane (dimethyl sulfide), 2-methylbuta-1,3-diene (isoprene), but-3-en-2-one (methyl vinyl ketone), butan-2-one (methyl ethyl ketone), 1,3-xylene (m-xylene), 3,7,7-trimethylbicyclo[4.1.0]hept-3-ene (3-carene).

Bespoke calibration mixtures

NPL created the 20-component mixture in collaboration with the PTR-MS community to cover the largest mass to charge range currently possible to enable the best constraints on the transmission curve function for these instruments. However, NPL can also provide bespoke mixtures containing different compounds and different amount fractions if required.

Don’t see what you are looking for? Our diverse skill set enables us to provide bespoke solutions. Please contact us to discuss your requirements.

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Find out more about Mass spectrometry calibration (SIFT-MS)

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