High-resolution gas chromatography and high-resolution gas chromatography/mass spectrometry study of the volatile fraction obtained from high-inertinite Brazilian coal by supercritical fluid extraction
✍ Scribed by Livia Mari Assis; Fernando Mauro Lanças
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 276 KB
- Volume
- 11
- Category
- Article
- ISSN
- 1040-7685
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✦ Synopsis
This work presents the results of a study involving a high-inertinite coal Ž . from Amando Simoes Mine, located in Parana state Brazil . The organic matter ˜Ž . was extracted in a supercritical fluid static mode apparatus using toluene as the extraction fluid in the presence of hydrogen. The variables were studied using a 2 3 Ž factorial design two levels for three variables: temperature, reaction time, and . pressure with three center points. The liquid coal extracts obtained were fraction-Ž . ated by preparative liquid chromatography into eight fractions PLC-8 by using an adequate series of eluents. Each eluted fraction was collected and quantified by gravimetry. The relative fraction yields were used to calculate the influence of the variables and their interaction in the factorial design. All hydrocarbon-rich frac-Ž . tions were analyzed by high-resolution gas chromatography HRGC -fluid ioniza-Ž . tion detection and HRGC-mass selective detection MSD . The characterization of chemical classes of interest in the collected fractions was carried out using HRGC-MSD in the extracted ion mode. This approach allowed fine monitoring of compounds of interest by their characteristic mrz values and was a fast and very selective setup for detection of specific compounds in a very complex matrix.