Direct temperature-resolved mass spectrometry

Case Studies Direct Temperature Resolved Mass Spectrometry (DTMS)... 

Direct introduction of a sample, either in solid or liquid state, in the ion source of a mass spectrometer may be achieved through two procedures the first one is based on the use of a direct insertion probe (DIP) the second one necessitates a direct exposure probe (DEP). Direct introduction followed by heating of the sample in the ion source of the mass spectrometer is also known as direct temperature resolved mass spectrometry (DTMS). 

J.J. Boon, and T. Learner, Analytical Mass Spectrometry of Artists Acrylic Emulsion Paints by Direct Temperature Resolved Mass Spectrometry and Laser Desorption Ionisation Mass Spectrometry, J. Anal. Appl. Pyrol., 64, 327 344 (2002). 

In addition to GC/MS, high performance liquid chromatography (HPLC/MS) has been used to analyse natural resins in ancient samples, particularly for paint varnishes containing mastic and dammar resins [34]. A partial limitation of chromatographic techniques is that they do not permit the analysis of the polymeric fraction or insoluble fraction that may be present in the native resins or formed in the course of ageing. Techniques based on the direct introduction of the sample in the mass spectrometer such as direct temperature resolved mass spectrometry (DTMS), direct exposure mass spectrometry (DE-MS) and direct inlet mass spectrometry (DI-MS), and on analytical pyrolysis (Py-GC/MS), have been employed as complementary techniques to obtain preliminary information on the... 

DTMS direct temperature-resolved mass spectrometry... 

Minor, E.C., Boon, J.J., Harvey, H.R., and Mannino, A. (2001) Estuarine organic matter composition as probed by direct temperature-resolved mass spectrometry and traditional geochemical techniques. Geochim. Cosmochim. Acta 65, 2819-2834. 

Boon, J.J., Learner,T. (2002) Analytical mass spectrometry of artists acryhc emulsion paints by direct temperature resolved mass spectrometry and laser desorption ionisation mass spectrometry. /. Anal. Appl. Pyrolysis, 64, 327. 

Boon, J. J., Klap, V. A., and Eghnton, T. I. (1998). Molecular characterization of microgram amoimts of oceanic colloidal organic matter hy direct temperature-resolved ammonia chemical ionization mass spectrometry. Organic Geochemistry 29(5—7), 1051—1061. 

EgUnton T. I., Minor E. C., Olson R. J., ZettlerE. R., Boon J. J., Noguerola A., Eijkel G., and Pureveen J. (1994) Microscale characterization of algal and related particulate organic matter by direct temperature-resolved ( in-source ) mass spectrometry. Mar. Chem. 52, 27—54. 

Direct temperature-resolved pyrolysis-mass spectrometry (DT-MS or TPPy-MS) performed close to the ion source is another rapid and sensitive technique in the characterisation of involatile... 

Table 2.40. Main characteristics of direct temperature-resolved pyrolysis mass spectrometry (TPPy-MS or DT-MS)...

Numerous applications have been shown to exist that overcome the general problems of lack of volatility and instability at higher temperatures that principally hamper direct analysis of surfactants by GC methods. Thus, a whole suite of derivatisation techniques are available for the gas chromatographist to successfully determine anionic, non-ionic and cationic surfactants in the environment. This enables the analyst to combine the high-resolution chromatography that capillary GC offers with sophisticated detection methods such as mass spectrometry. In particular, for the further elucidation of the complex mixtures, which is typical for the composition of many of the commercial surfactant formulations, the high resolving power of GC will be necessary. 

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