On-line pyrolysis

More recently on-line pyrolysis with HMDS has been performed successfully even if the pyrolysis interface was kept at 250°C. In fact, Domenech-Carbo and colleagues [57,58] have obtained very good results on a variety of art materials and on real paint samples as well. They have applied Py-GC/MS with on-line trimethylsilylation to the characterization of diterpenoid resins and, in contrast to previous literature data, the derivatization method enabled not only the identification of resinous carboxylic acids in the form of TMS esters, but also an efficient conversion of hydroxyl groups to TMS ethers. 

D. Scalarone, O. Chiantore and C. Riedo, Gas chromatographic/mass spectrometric analysis of on line pyrolysis silylation products of monosaccharides, J. Anal. Appl. Pyrol., 83, 157 164 (2008). 

Tobias, H. J. and Brenna, J. T. (1997) On line pyrolysis as a limitless reduction source for high precision isotopic analysis of organic derived hydrogen. Analytical Chemistry 69, 3148 3152. 

It is also possible to quantitatively convert all water oxygen directly to CO2 by reaction with guanidine hydrochloride (Dugan et al. 1985) which has the advantage that it is not necessary to assume a value for the H2O - CO2 isotope fractionation in order to obtain the ratio. On-line pyrolysis using TC-EA systems repre-... 

Sandmeier EP, Keller J, Heinzle E, Dunn IJ, Bourne JR (1988) Development of an on-line pyrolysis mass spectrometry system for the on-line analysis of fermentations. In Hienzle E, Reuss M (eds). Mass Spectrometry in Biotechnological Process Analysis and Control. Plenum, New York, p 209... 

Complementaiy to the chemical degradation techniques an on-line pyrolysis - GC/MS method was applied to the pre-extracted sediment residues. 

Gaschnitz, R., Krooss, B. M., Gerling, P., Faber, E., and Littke, R., On-line pyrolysis-GC-IRMS isotope fractionation of thermally generated gases from coals. Fuel, 80, 2139-2153, 2001. 

In order to obtain greater information about the composition of polymers and macromolecular material, modifications to the analytical pyrolysis process have been developed. These have included on-line pyrolysis hydrogenation of polyolefines using hydrogen carrier gas and a palladium catalyst. Polyacetals have been pyro-lyzed in the presence of a cobalt catalyst to produce cyclized compounds that afford greater information about the structure of the polymer. ... 

On-line pyrolysis-FTIR studies of evolved degradation products from polymeries provide rapid, unique information that is useful in formulating fire retardant materials. PyFTIR studies of flame retarded cotton fabrics [853] have been used to retrieve information on evolved gases and condensibles in dependence on the pyrolysis temperature. 

Also obtained from pyrolysis behaviour of 4-oxo-P-damascone by on-line pyrolysis gas chromatography-mass spectrometry [4143]. 

Figure 9 Schematic representation of six on-line pyrolysis-mass spectrometry configurations. ( ) Ionization zone ( ) pyrolysis zone.

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