The Vocus CI-TOF directly measures trace compounds in air in real time
Chemical ionization mass spectrometers with sub-ppt limits of detection for volatile organic and inorganic compounds (VOCs and VICs). Optimized for use in laboratory, industrial, and mobile applications.
Real-Time Chemical Analysis of Air
Unmatched Sensitivity and Speed
Vocus mass spectrometers directly sample air, ionize molecules by chemical ionization (CI) and measure the ions by mass spectrometry. Composition is instantaneously reported with part-per-trillion (ppt) limits of detection.
No Need for Chromatography
Vocus measurements are selective for specific classes of volatile organic and inorganic compounds (VOCs and VICs), and analytes are ionized with limited fragmentation so that molecular ions are observed. These features – along with high mass resolving power – allow real-time characterization of complex mixtures without chromatography.
Flexibility Ionization to Target Your Compounds of Interest
Vocus CI-TOFs are available with two interchangeable CI reactors – Vocus PTR and Vocus Aim – each optimized to target different classes of compounds. Configure a system to address your varied and evolving requirements.
Unparalleled real-time detection of volatile organic compounds (VOCs) with Vocus CI-TOF.
Flexible Ionization to Target Your Compounds of Interest
Vocus ionizes molecules by controlled reactions with reagent ions in a reactor. Reagent ions are selective for specific classes of compounds. Vocus CI-TOFs are tailored to meet users' needs:
- One reactor with a single reagent ion
- One reactor that can switch between multiple reagent ions in a single experiment
- Two reactors that can be interchanged between experiments, each with different reagent ions
|Reagent Ion||Analyte Compound Classes||Example Applications||Reactor|
|H3O+ (PTR)||Small oxygenated compounds, polar molecules, BTEX, PAHs, other aromatics||Air quality analysis, food and flavor, environmental contamination||PTR|
|NH4+||Highly functionalized VOCs, oxygenated compounds, peroxides||Explosives and narcotics detection, photochemical oxidation products||PTR|
|NO+||Alcohols, substituted aromatics, cyclic and branched alkanes, long-chain semi-volatile alkanes||Vehicle exhaust, wine contaminants||PTR|
|O2+||Alkanes, carbon disulfide, ammonia, halogenated compounds||Ambient air monitoring, vehicle exhaust||PTR|
|I–||Oxygenated organics, acids, peroxides, inorganic acids, inorganic compounds||Ambient air monitoring, biomass burning, SOA formation, semiconductor||Aim|
|Br–||Iodine containing compounds, HO2 radicals, mono carboxylic acids||Ambient air monitoring, sea emissions||Aim|
Real-time Reagent Ion Switching. Ions using the same reactor can be alternated during a single experiment in milliseconds to seconds.
Reactor Interchange. Reactors can be easily interchanged between experiments in less than 30 minutes.
Proton transfer reaction mass spectrometry (PTR-MS) is a powerful technique for the analysis of a broad range of volatile organic compounds (VOCs). The proprietary Vocus PTR Reactor reduces wall losses and focuses ions with RF fields to give you up to 10x the sensitivity of other commercial PTR-MS. The Vocus PTR Reactor is further compatible with other reagent ions schemes , including ammonium adduct ionization - to target broader ranges of compounds.
|Reagent Ions||H3O+ (PTR), NH4+, NO+, O2+|
|Reagent Ion Switching||Up to 3 ions during a single experiment Switching time: < 5 seconds|
|Reagent Ion Generation||DC plasma|
|Operating Conditions||Sampling flow: 100 sccm, Pressure: 2-4 mbar, Axial gradient: 600 V|
The Vocus Aim Reactor offers fast, sensitive detection of trace organic and inorganic compounds spanning the entire volatility range. The flow tube reactor operates at an increased pressure to suppress fragmentation of analyte ions, and uses compact VUV sources to generate both positive and negative reagent ions.
|Reagent Ions||I–, Br–|
|Reagent Ion Switching||Up to 3 ions during a single experiment|
Switching time: <5 seconds
Fast switching option: 0.25 seconds (2 reagent ions of single polarity)
|Reagent Ion Generation||VUV Ion Source|
|Operating Conditions||Sampling flow: 2000 sccm, Pressure: 50-100 mbar, Axial gradient: Field Free|
Volatile organic compounds (VOCs) are ubiquitous chemicals that play a significant role in many systems, including health, the environment, food, and industry. The Vocus CI-TOF offers unprecedented performances for real-time identification and quantification of trace VOCs in all fields.