title: Determination of reduced sulfur compounds in air samples for the monitoring of malodor caused by landfills.
abstract: A reliable method for determining malodorous reduced sulfur compounds (RSC) in atmospheric samples has been developed. The method uses an activated coconut solid-phase sorbent for active sampling, hexane as desorption solvent, and gas chromatography-mass spectrometry (GC-MS) technique for specific and sensitive separation-detection. The compounds analyzed were hydrogen sulfide, ethyl mercaptan, dimethyl sulfide, carbon disulfide, butyl mercaptan and dimethyl disulfide. Recovery efficiency varied between 75% and 97% and no detectable losses were observed during storage at -20°C. Satisfactory analytical parameters were reported, such as good linearity (r(2)>0.98), low detection limits (0.6-59 pg m(-3)), adequate repeatability (9%) and reproducibility (17%), and fast GC-MS analysis (<6.5 min). The accurate determination of RSCs, free of interferences from atmospheric components, such as ozone or water was demonstrated. The method has been applied to analyze the composition of environmental air close to three landfills processing urban and industrial solid wastes. The results indicated that hydrogen sulfide and ethyl mercaptan were the main molecules responsible of malodor phenomenon in the study areas.
authors.affiliation: Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), 46980 Paterna, Valencia, Spain. Electronic address: esther@ceam.es.
authors.forename: Esther
authors.initials: E
authors.lastname: Borrás
authors.affiliation: Departamento de Química-Instituto IDM, Universitat Politècnica de València, 46022 Valencia, Spain.
authors.forename: Luis Antonio
authors.initials: LA
authors.lastname: Tortajada-Genaro
authors.affiliation: Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM), 46980 Paterna, Valencia, Spain.
authors.forename: Amalia
authors.initials: A
authors.lastname: Muñoz
mesh_terms: D000388:Air / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D052638:Particulate Matter / Q000032:analysis*; D013457:Sulfur Compounds; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D013457:Sulfur Compounds
keywords: Gas chromatography–mass spectrometry; Malodor compounds; Reduced sulfur compounds; Solid-phase sampling