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Chemical and biological characterization of volatile components of environmental samples after fractionation by vacuum line cryogenic distillation


Chemical and biological characterization of volatile components of environmental samples after fractionation by vacuum line cryogenic distillation



Archives of Environmental Contamination and Toxicology 14(3): 289-297



ISSN/ISBN: 0090-4341

PMID: 2408589

DOI: 10.1007/bf01055405

Volatile components from diesl exhaust particles and coal gasifier process gas constant were vacuum fractionated by cryogenic distillation and identified by infared spectroscopy and gas chromatography/mass spectrometry. The vacuum distillation line consisted of a sample flask and 9 traps cooled from 0.degree. to -196.degree. C in approximately 20.degree. C steps. The pressure in the vacuum line of .apprx. 10-2 Torr was maintained with a vacuum pump. Separated compounds were identified by comparison to reference infrared spectra and confirmed by comparison with standards when practical. Volatile compounds indentified from the diesel exhaust particle sample included NOx, CO2, SO2, alkanes, aldehydes, and 1 and 2 ring aromatic hydrocarbons. Volatile compounds identified in process gas condensate from a coal gasifier were ammonia, carbonyl sulfide, CO2, C3-C7 hydrocarbons, 1 and 2 ring formatic hydrocarbons and phenols. Volatile components collected at either 0.degree. or -24.degree. C were evaluated to determine their genotoxicity using the Chinese hamster ovary/hypoxanthine-guainine phosphoribosytranferase (CHO/HGPRT) assay. Neither the gasifier condensate nor diels particle samples produced mututation at the HGPRT locus. The diesel samples were not cytotoxic at the concentrations tested (100 .mu.g/ml) but the gasifier samples resulted in 50% of cell killing at concentrations between 25 and 100 .mu.g/ml depending on the temperature of collection and the test collections. Vaccuum desorption with cryogenic distillation has provided a means to separate the volatile components in complex environmental samples to allow chemical and biological characterization of these components.

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