Enter the new dimension of online mass spectrometry with Switchable Reagent Ions (SRI) featuring H3O+, NO+ and O2+ as precursor ions.
Quantify more volatile compounds than ever in real-time with PTR+SRI-MS and take advantage of single-digit pptv-level detection limits, only available with IONICON PTR-MS.
Order your new IONICON PTR-MS with Switchable Reagent Ions (SRI) capabilities or consult with us concerning upgrade capabilities of your instrument.
Advantages of using H3O+, NO+ and O2+ as precursor ions
H3O+ is ideal for many applications as our customers have proven for more than a decade. In some cases however it can be useful to use more than one reagent ion in your PTR-MS.
By using SRI isomeric VOC compounds can be separated and instantaneously quantified (the differentiation of isobaric compounds is already possible by using IONICON PTR-TOFMS series).
NO+ is like H3O+ a soft ionizer, ionization occurs mainly through charge transfer, whereas O2+ is found to be a less soft chemical ionization agent and can be used where proton transfer from H3O+ does not work. Therefore more VOCs than ever can be quantified in real-time with PTR+SRI-MS.
Learn more about the advantages of SRI in the relevant section of our FAQs...
Market-leading detection limit also with PTR+SRI-MS
We have developed a PTR+SRI-MS where the chemical reagent ions NO+ and O2+ are generated in our new ULTRA-PURE ion source at intensities matching or in case of NO+ even surpassing those of traditional IONICON PTR-MS H3O+ ions by up to 40%, thus enabling ultra-high sensitivity and ultra-low detection limits also for this new dimension of PTR-MS technology.
This overcomes one of the biggest down-sides of competing technologies like SIFT-MS, where mass pre-selection of ions is employed and a carrier gas dilutes the sample, at the expense of some two orders of magnitude lower detection sensitivity for VOCs.
The PTR+SRI-MS products
H3O+, NO+ and O2+ as precursor ion package is available as an option for all current IONICON instruments.
Upgrades for existing customers and PTR-MS instruments are possible depending on the configuration of your system.
Related downloads:
PTR+SRI-MS Sensitivity & LoD Poster (0.2 MB .pdf)
H3O+, NO+ and O2+ as precursor ions in PTR-MS: isomeric VOC compounds and reactions with different chemical groups (0.2 MB .pdf)
PTR-MS technology overview folder (0.4 MB .pdf - 8 pages A4)
Related article in press:
A. Jordan, S. Haidacher, G. Hanel, E. Hartungen, J.Herbig, L. Märk, R. Schottkowsky, H. Seehauser, P. Sulzer, T. D. Märk: An online ultra-high sensitivity proton-transfer-reaction mass-spectrometer combined with switchable reagent ion capability (PTR+SRI-MS), International Journal of Mass Spectrometry (2009). Link
Top
