Analytical Instrument Documents

Three polydimethylsiloxane compounds: octamethylcyclotetrasiloxane (sample 1), decamethylcyclopentasiloxane (sample 2) and octa(dimethylsiloxy)silsesquioxane (sample 3), were analyzed using a GC/TOFMS. The first two samples are relatively small molecules with molecular weights of 296 and 370, respectively, so they were introduced into the system through the mass reference sample inlet (reservoir). Sample 3 is a much bigger molecule with a molecular weight of 1,016 that could not be introduced through the reservoir. As a result, this sample was introduced by injecting it into the GC.

A UV and visible light curing adhesive is a liquid composed of monomer, oligomer, initiator and additives. These adhesives cure over a short period of time when they are exposed to the appropriate light. In this report, a photo polymerization initiator found in a UV light curing adhesive was analyzed by electron ionization (EI) and field ionization (FI) using the high resolution and high mass accuracy capabilities of the AccuTOF-GC.

Organogermanium compounds are organometallics that contain a carbon to germanium chemical bond. Germanium shares group 14 in the periodic table with silicon, tin and lead and the chemistry of organogermanium is somewhat similar to that of organosilicon compounds and organotin compounds. While metallic germanium is widely used in semiconductor devices, infrared light sensors, etc., organogermanium is advocated as a non-toxic alternative to many toxic organotin reagents. In this work, we report the analyses of organogermanium compounds by field desorption (FD) using the JMS-T100GC “AccuTOF-GC” time-of-flight mass spectrometer.

Ionic liquids are liquids that are predominantly comprised of ions and ion-pairs. More recently, this term has generally referred to salts that are in a liquid state at room temperature. Ionic liquids are electrically conductive and have an extremely low vapor pressure. Additionally, many of these liquids have low combustibility and excellent thermal stability. As a result of these properties, ionic liquids are expected to find many applications as functional materials.

Comprehensive two-dimensional gas chromatography (GCxGC) in combination with high-resolution mass spectrometry (HRMS) is a powerful tool for the analysis of complex mixtures. However, new software tools are required to facilitate the interpretation of the rich information content in GCxGC/HRMS data sets. In this work, we analyzed a dust sample collected from an electronics recycling facility by using GCxGC in combination with a new high-resolution time-of-flight (TOF) mass spectrometer. Nontraditional Kendrick Mass Defect (KMD) plots were used to identify halogenated contaminants in an electronics waste sample. Database search results combined with elemental composition determinations from exact-mass data were used to identify (potential) persistent organic pollutants (POPs).

Comprehensive two-dimensional gas chromatography (GC×GC) is a kind of continuous heart-cut GC system. Two different types of columns are connected via a modulator in the same GC oven. By using the two columns together, this technique provides very high separation capabilities when compared to one- dimensional GC analysis. This report shows the difference of separation result for diesel oil when 2 different sets of combined columns are used with GC×GC-HRTOFMS (FI).

A commercially available polyoxypropylene (PO) - polyoxyethylene (EO) block copolymer was analyzed by using the JMS-T100GC “AccuTOF GC” field desorption (FD) method. A group-type analysis was performed on the resulting mass spectrum.

Field desorption (FD) is an ionization method that utilizes electron tunneling in a high electric field near the emitter surface or whisker tip. Sample is applied directly on the emitter, and is then heated by applying an electric current through the emitter for desorption and ionization. FD has been used to analyze nonvolatile compounds, polymers, etc. as a soft ionization method that produces intact molecular ions with very few fragment ions in most cases. In this work, we used FD to analyze several near infrared (NIR) photosensitive dyes that were designed as photoinitiators for the polymerization of functional polymers.

Field desorption (FD) is an ionization method that utilizes electron tunneling in a high electric field near the emitter surface or whisker tip. Sample is applied directly on to the emitter and is then heated by applying an electric current through the emitter for desorption and ionization. FD has been used to analyze nonvolatile compounds, polymers, etc. as a soft ionization method that produces intact molecular ions with very few fragment ions in most cases. In this work, we used FD to analyze several quaternary borate ammonium salts that are designed as photoinitiators for the polymerization of

Field Ionization (FI) is a soft ionization method which ionizes analytes by electron tunneling from analyte molecules to a solid surface (emitter) in a high electric field. The vaporized analyte molecules are introduced into the proximity of the emitter in order for ionization to occur. In this work, we have analyzed multifunctional thiols, which are curing agents for functional polymers, by GC/EI and GC/FI methods and then compared the resulting mass spectra.