title: Comparison between sampling and analytical methods in characterization of pollutants in biogas.
abstract: Different sampling methods involving the collection of biogas by Tedlar bags or adsorption tubes, and different GC-MS injection systems, loop injection or cold trap injection (with bags or by tube desorption), were compared to establish the best method to determine the minority compounds in biogas from sewage treatment plants (STPs). A study of parameters is included, such as the stability of compounds in Tedlar bags or cartridges and the adsorption effect of some less volatile compounds in the thermal desorption system (TD). The optimized methods allowed to determine most compounds at low mgm(-3) levels. Among them, maximum values of D5 (4.84 mg m(-3)), decane (95-118 mg m(-3)) and H(2)S (2223 mg m(-3)) were found in biogas samples.
authors.affiliation: Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Marcel·lí domingo s/n, Campus Sescelades, 43007 Tarragona, Spain.
authors.forename: Sílvia
authors.initials: S
authors.lastname: Mariné
authors.forename: Marta
authors.initials: M
authors.lastname: Pedrouzo
authors.forename: Rosa Maria
authors.initials: RM
authors.lastname: Marcé
authors.forename: Ignacio
authors.initials: I
authors.lastname: Fonseca
authors.forename: Francesc
authors.initials: F
authors.lastname: Borrull
mesh_terms: D000327:Adsorption; D056804:Biofuels / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012722:Sewage / Q000737:chemistry; D013696:Temperature; D014865:Waste Disposal, Fluid
chemical_list: D056804:Biofuels; D004785:Environmental Pollutants; D012722:Sewage