Abstract
An on-line analytical method has been developed to characterise brown coal samples and pieces from brown-coal based briquettes. The direct laser desorption from the sample into the gas flow of a gas chromatograph/mass spectrometer (GC/MS) allows an on-line analysis of polymer or macromolecular matrices, e.g. brown coal samples. This technique allows for analysis of coal without time-wasting clean-up steps as required in a classical ‘solvent-based’ analysis. In this study two brown coal samples of different origin were investigated by on-line coupled laser desorption GC/MS (LD/GC/MS). The results were compared with classical analytical techniques like solvent-extraction or thermodesorption. Even though the laser pyrolysis led to distinctly different results in comparison to the classic methods, the chromatograms produced were reproducible and unique for each coal. The laser desorbed products can be divided into two types: pyrolysis compounds liberated from the coal matrix and unsaturated hydrocarbons generated by laser radiation.
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