A proton transfer reaction mass spectrometer (PTR-MS) with sub-ppt limits of detection and mass resolving power up to 15000
Announcing Improved Vocus PTR-TOF Performance and a New Model for Online VOC Monitoring
The Vocus PTR-TOF is a proton transfer reaction mass spectrometer (PTR-MS) for sensitive, real-time detection of volatile organic compounds (VOCs) in industrial, laboratory, and field applications.
The unique Vocus ion molecule reactor (IMR) improves almost all aspects of PTR-MS performance, while maintaining critical specifications and reaction processes that have been established for conventional designs.
These fundamental aspects of Vocus PTR-TOF performance are key to its fast, ultra-sensitive measurement of trace VOCs.
The RF focusing fields in the Vocus ion molecule reactor improve sensitivity while maintaining product ion energies and recorded branching ratios that are nearly identical to those of traditional drift-tube PTR ion-molecule reactor designs.
Vocus PTR-TOF mass spectra are dominated by protonated peaks and free of significant contributions from non-PTR reaction and therefore easily interpreted and quantified.
The Vocus PTR-TOF routinely detects a very large number of VOCs, including many for which standards are not available. It is possible to calibrate for all detected compounds with good accuracy based on simple measurements of a small number of VOC standards.
The combination of its efficient inlet system, heated reaction cell, and high sensitivity makes the Vocus PTR-TOF the optimum detector for high throughput or highly time resolved measurements of low volatility organic compounds.
| Sensitivity cps/ppb xylene | Limit of Detection (LOD) 1-min / 1-s, xylene | Resolving Power at Specified Sensitivitya M/ΔM | Maximum Resolving Powera M/ΔM | Size | Power Max / Typical | |
|---|---|---|---|---|---|---|
| 2R | 30001 | 1 ppt / 10 ppt | 10000 | 15000 | 160 kg < 0.45 m3 480 x 615 x 1480 mm | 600 / 590 W |
| S | 30001 | 1 ppt / 10 ppt | 5000 | 7000 | 120 kg < 0.35 m3 480 x 615 x 1130 mm | 600 / 590 W |
| Scout | 4000 | 5 ppt, 1 min | 3500 | 4000 | 120 kg < 0.35 m3 480 x 615 x 1130 mm | 600 / 590 W |
| Elf | 500 | 20 ppt, 1 min | 500 | 750 | 55 kg < 0.125 m3 380 x 500 x 650 mm | 450 /400 W |
a. Each model can be operated with higher resolving power at reduced sensitivity.
| Sample Flow Rate | 50-500 sccm typical 100 sccm |
| Operating Pressure | 0.5 – 5 mbar typical 1-2 mbar |
| Axial Gradient | Uniform linear field 0-5 V/mm |
| Reagent Ions | H3O+, NO+,O2+, NH4+ |
2020
2019
2018
Practical Implications of High Sensitivity in Mass Spectrometry The video below uses the example of detecting trace levels of the compound TCA in cork wine
Proton Transfer Reaction – Mass Spectrometry (PTR-MS) is the most widely used method for real-time monitoring of volatile organic compounds (VOCs) at low concentrations Key
Volatile organic compounds (VOCs) are ubiquitous chemicals that play a significant role in many systems, including health, the environment, food, and industry. Characterization of VOCs can be complicated because they are often trace constituents within complex mixtures. The Vocus PTR-TOF offers unprecedented performances for real-time identification and quantification of VOCs in all fields. The following examples illustrate the instrument’s key advantages. Contact us to discuss other applications or request a demonstration with your samples.
