Highly Sensitive Gas Chromatography-Mass Spectrometry (GC-MS) Coupling to Thermal Analyzers for Precise Identification of Gas Species

How to best identify the evolved gases in complex gas mixtures? Separate the gas species first!

The primary scope of TGA/STA-GC-MS coupling is to detect, separate and analyze organic components.
GC is a high-resolution method for separating volatile and semi-volatile compounds. The gas mixtures are separated based on the differences in component distribution between a stationary phase (e.g. inner coating of a capillary) and a mobile phase (purge gas; e.g., helium). Since the gas separation in the GC column takes a certain amount of time (the duration depends on sample characteristics, column flow rate, column length, and stationary and mobile phase), it is not possible to couple directly into the GC with a continuous online sample gas flow. 

The NETZSCH Solution: Quasi-Direct Coupling

Our response therefore, was to develop a direct coupling solution in a quasi-continuous mode by using heated automatic valves, this allows for software-controlled gas sampling (flow-through sampling loop) and gas injection even at short intervals.

STA-GC-MS

• Unique TGA/STA-GC-MS coupling solution
• Perfectly heated gas transfer (300°C) from the thermal analyzer to the valve box and the injector at the GC
• Glass-lined steel pipe allows for forced flow by pumping through the sampling loop

Valves-Based Gas Injector

• Double loop system for short injection intervals
• Software integrated in Proteus®
• Special insulation design for constant temperature (300°C) to prevent cold spots
• Independent injector system (standard injectors available for additional uses)
• Possible to bypass the column for direct MS coupling

Gas Chromatograph

• Fast change of column without venting the MS
• Multiple columns available for specific applications
• Split, splitless, pulsed split
• GC furnace up to 450°C

Mass Spectrometer

• State-of-the-art MS 1.5 u to 1022 u with a high-speed sampling rate up to 22.222 u/s
• Tool-free servicing, e.g., simplified ion source maintenance without any need for tools
• Multiple ionization modes (optionally available EI, PI, CI, etc.)
• Stand-alone MS measurements

For GC-MS coupling, we rely on the world-renowned suppliers, Agilent and Jeol. Their products allow for perfect GC-MS supply and service quality, as we at NETZSCH expect of any entity with which we do business. This guarantees optimized performance for our own products.

Analysis of, Such Substances as Additives, Stabilizers, and Solvents in

• Food
• Pharmaceuticals
• Cosmetics
• Polymers
• Biomass

GC-MS Measurement Information

• Separation of complex gas mixtures
• Gas detection and identification
• Compositional analysis
• Solid-gas reaction
• Decomposition products
• Pyrolysis gases
• Combustion products
• Flue gas identification
• Identification of additives (e.g., plasticizers)

Literature

You may also be interested in:

TGA/STA - FT-IR Coupling

Different thermal analysis systems can be combined with a Fourier Transform Infrared Spectrometer (FT-IR), which has proved its efficiency especially in the organic field (instrument for EGA: evolved gas analysis).

STA 449 F3 Jupiter®

The STA 449 F3 Jupiter® combines the advantages of a high sensitive thermobalance and a true Differential Scanning Calorimeter. Various furnaces and TG, TGA-DTA and TGA-DSC sensors can be used, whereby the system can be easily optimized for the most versatile applications.

PERSEUS® TG 209 F1 Libra® - TGA-FT-IR Coupling

The PERSEUS® TG 209 F1 Libra® is an unmatched alliance between the NETZSCH TG 209 F1 Libra® and a compact FT-IR spectrometer by Bruker Optics. Its design is unprecedented and sets a benchmark for state-of-the-art coupling systems.

TG 209 F1 Libra®

Flexibility with the fittings of this premium instrument for thermogravimetry allow it to cover almost any imaginable application in the range up to 1100°C. The system has many outstanding features: BeFlat® function allows or immediate measurement upon switching on the unit, the system’s heating rates of up to 200 K/min allow for faster results, while its corrosion-resistant ceramic furnace withstands even fluorine- or chlorine-containing polymers, c-DTA® function for the detection of exothermal and endothermal reactions.

PERSEUS® STA 449 F1/F3 Jupiter® – STA-FT-IR Coupling

The PERSEUS® STA 449 F1/F3 Jupiter® is an unmatched alliance between two successful instruments: the NETZSCH STA 449 F1/F3 Jupiter® and the FT-IR spectrometer by Bruker Optics. Its design is unprecedented and sets a benchmark for state-of-the-art coupling systems.

STA 449 F1 Jupiter®

With the STA 449 F1 Jupiter® NETZSCH is setting new standards. Unlimited configuration flexibility and unmatched performance are the foundations for a great variety of application possibilities in the fields of ceramics, metals, plastics, and composites over a broad temperature range (-150°C ... 2400°C).