Pyrolysis-GCMS
Pyrolysis gas
chromatography mass spectrometry
A versatile tool for
the analysis of polymers, insoluble samples and a broad range of compounds,
which cannot be introduced into GC directly.
Pyrolysis gas chromatography mass spectrometry (Py-GCMS) can
be used to characterize most materials including insoluble and complex
materials at trace levels often without any sample pretreatment e.g. polymers,
plastics, rubber, paints, dyes, resins, coatings, cellulose, wood, textiles,
oils etc.
Due to the direct sample introduction and the chromatographic
separation, it is possible not only to analyze very small amounts but also to
obtain detailed, unique information, which is unobtainable by other analytical
techniques.
The Multi-Shot Pyrolyzer EGA/PY 3030D with its vertical micro
furnace is the top-class model in the series of multi-function pyrolyzers
developed by Frontier Laboratories Ltd.
Material
characterization using multiple analytical methods
For characterization of very complex and challenging samples
four powerful analytical techniques are available:
Evolved gas analysis
(EGA-MS)
For EGA analysis a short and narrow (2.5 m, 0.15 mm i.d.)
deactivated capillary tube without a stationary phase is used as direct
connection between GC-injector and mass-detector. As the sample is temperature
programmed over a given temperature range (i.e. 40 - 800 °C) , the evolved
gases flow to the detector without chromatographic separation. The result shows
the simple thermogram such as a differential thermogravimetric curve for a
given sample.
Single-shot analysis
(Py-GCMS)
The sample cup free-falls into the preheated pyrolyzer
furnace. The sample temperature goes from ambient to the pyrolysis temperature
in less than 20 msec. Pyrolysis occurs instantly and the pyrolyzates are
introduced into a capillary column for separation without second reaction.
Double-Shot analysis
(TD/Py-GCMS)
Double Shot analysis provides both: information about
volatile compounds e.g. monomers or additives and the polymeric content of the
sample. Therefore the sample analysis is divided into two steps:
Step 1: during the thermal desorption step the sample is
heated over a temperature range and the volatile compounds evolve from the
sample. The evaporated compounds are trapped at the beginning of the GC column
and analyzed via GCMS after the temperature program of the pyrolyzer is
finished.
Step 2: the residual sample is pyrolyzed at a temperature
determined by EGA data. The program facilitates the identification of the
polymeric composition of the sample.
Heart-cut analysis
(Heart-cut EGA-GCMS)
In cases where highly complex samples demand a detailed
analysis, Heart-cut EGA-GCMS is the most useful technique to determine the
composition of the sample. In this technique, the evolved gas analysis (EGA) is
used to obtain a thermogram and each temperature zone of interest can be
analyzed separately. By heart cutting components evaporated in this interesting
temperature zones are selectively introduced to a GC column, temporarily
trapped at the beginning of the column and finally analyzed by GCMS. This technique
allows a detailed characterization of a polymer as well as target compound
analysis in complex matrix, e.g. additive analysis in mineral oil.
Features of the
Multi-Shot Pyrolyzer EGA/PY-3030D
- Rapid heating (600 °C/min) and cooling (100 °C/min)
- High temperature pyrolysis up to 1050 °C
- Superior performance due to exact temperature control,
inert sample pathway, no dead volumes, no cold spots
- Dedicated samplers for sample introduction e.g. Micro
Reaction Sampler, UV Sampler
- Special F-Search SW and various libraries (Additive-,
Pyrogram-, Pyrolyzate-, EGA-Library)
- Valuable accessories:
Auto-Shot sampler (capacity: 48 sample cups)
Cryo Trap (Micro Jet Cryo Trap), Vent-free GCMS adaptor
Carrier Gas Selector (for pyrolysis under air atmosphere)
High temperature capillary columns (Ultra Alloy)
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