Pyrolysis gas chromatography mass spectrometry
- Pyrolysis gas chromatography mass spectrometry
Infobox chemical analysis
name = Pyrolysis gas chromatography mass spectrometry
caption =
acronym =PyGCMS
classification = Mass spectrometry
analytes = synthetic polymers
biomolecules
manufacturers =
related = gas chromatography
hyphenated =
Pyrolysis gas chromatography mass spectrometry is a method of chemical analysis in which the sample is heated to decomposition to produce smaller molecules that are separated by gas chromatography and detected using mass spectrometry.[cite journal | author = Halket JM, Zaikin VG | title = Derivatization in mass spectrometry --7. On-line derivatisation/degradation | journal = European journal of mass spectrometry (Chichester, England) | volume = 12 | issue = 1 | pages = 1–13 | year = 2006 | pmid = 16531644 | doi = 10.1255/ejms.785] ]How it works
Pyrolysis is the thermal dissociation of materials in an inert atmosphere or a vacuum. The sample is put into direct contact with a platinum wire, or placed in a quartz boat inside a platinum coil, and rapidly heated to 600 – 800 C. Large molecules cleave at their weakest points and produce smaller, more volatile fragments. Various methylating reagents, which increase the volatility of polar fragments, can be added to a sample before pyrolysis. These fragments can then be separated on a gas chromatograph (GC).
Applications
Pyrolysis gas chromatography is very useful for the identification of synthetic polymeric media, such as acrylics or alkyds, and synthetic varnishes. [ cite web|url=http://www.nga.gov/resources/scienceresearch/glossary.shtm |title=National Gallery of Art Conservation: Scientific Research |accessdate=2007-08-21 ] It can also be used for environmental samples.[cite journal | author = Janos P | title = Separation methods in the chemistry of humic substances | journal = Journal of chromatography. A | volume = 983 | issue = 1-2 | pages = 1–18 | year = 2003 | pmid = 12568366 | doi = ] , including fossils.][cite journal |author=Poinar HN |title=The genetic secrets some fossils hold |journal=Acc. Chem. Res. |volume=35 |issue=8 |pages=676–84 |year=2002 |pmid=12186573 |doi=] ]References
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