Solid-phase microextraction for determination of background levels and point-source emissions of volatile sulfur compounds in the bioindustry

Andersson, Fräs AnnikaLinköpings universitet,Tema vatten i natur och samhälle,Filosofiska fakulteten (författare)

The present study was conducted to develop a rapid, matrix-independent technique for simultaneous analysis of nine different volatile sulfur compounds (VSCs) in complex gas matrices.The potential of using solid-phase microextraction (SP:ME) in this context was investigated, and, to achieve the best sensitivity and avoid artifact formation and competitive adsorption, pel'formance ofthe following fiber coatings was tested: Carboxen/polydimethylsiloxane (CARIPDMS),divinylbenzene/ polydimethyl-siloxane (DVBIPDMS), and Carboxen/divinylbenzene/polydimethylsiloxane (CAR/DVBIPDMS). The optimal injector temperature and desorption time for each fiber were dete1n1ined by experimental design. The samples analyzed were collected in Tedlar bags at a biogas facility and a sewage treatment plant to represent background levels and point-source emissions. The samples were subsequently dried over CaClz and preconcenti·ated bySPME, and the target compounds were analyzed by GC-MS. CARIPDMS induced the lowest level of artifact formation and initially also exhibited the broadest range of linear adsorption kinetics. Anextraction time of 2.5 min gave no matrix effects, despite the complexity of the samples, and the analytes were accurately quantified using extemal calibration curves below odor thresholds.Detection limits ranged from 0.008 (CS2) to 2.5 (H2S) ppbv, and the relative standard deviation was 4-16%.

SAMHÄLLSVETENSKAP Annan samhällsvetenskap Tvärvetenskapliga studier inom samhällsvetenskap hsv//swe
SOCIAL SCIENCES Other Social Sciences Social Sciences Interdisciplinary hsv//eng
Solid-phase microexh·acUon
Volatile sulfur compounds
Air analysis
Matrix effects
Artifact formation
Competitive adsmption
INTERDISCIPLINARY RESEARCH AREAS
TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN

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