Pyrolysis GC-MS

SGS M-Scan has two Pyrolysis GC-MS systems, the Frontier Laboratories PY2020D double-shot pyrolyser coupled to a Shimadzu QP2010 GC-MS and the Pyrola 2000 pyrolyser coupled to a PE Turbomass Gold GC-MS. Both these systems provide powerful combinations for the analysis of non volatile substances including paper, textiles, paints, rubber and polymers.

Samples are placed on the platinum filament of the pyrolysis probe which can be heated to 1000oC in less than 8 milliseconds. Rapid heating can be important when it is necessary to ensure that most of a sample is pyrolysed before it is volatilised. The rate of heating and the maximum temperature can be controlled to provide the desired information from each sample. There are a variety of different ways of heating the sample to provide as much information as possible for any given sample:

Thermal Desorption is used when a sample is thought to contain volatile substances. The sample is heated to a low temperature typically 50-225oC.

Isothermal Pyrolysis uses a fast temperature rise to a constant temperature usually between 500-700oC.

Sequential Pyrolysis is used for kinetics studies into degradation rates.

Fractionated Pyrolysis technique is used when the sample is a mixture of different non-volatile substances to facilitate the interpretation of the results of the complex mixture.

Pyrotomy, for non homogeneous samples e.g. laminates. The sample is pyrolysed for a short time so that only the layer of the sample closest to the filament is heated. A laminate can be pyrolysed layer by layer using this method.