title: Gas chromatographic methods for monitoring of wastewater chlorophenol degradation in anaerobic reactors.
abstract: Wastewater samples from an anaerobic reactor were extracted with hexane and derivatized with diazomethane (method 1) and with acetic anidride (method 2). Gas chromatography with electron-capture detection (ECD) was employed for separating the parent compound and intermediates trichlorophenols (TCP) and dichlorophenols (DCP) which originated from the penta chlorophenol (PCP) degradation process. The relations between concentrations of PCP, TCP and DCP areas were linear in the range of concentrations of 0.2 to 8 mg/L and 0.025 mg/L to 5 mg/L for methods 1 and 2, respectively. The repeatability of the extraction methods was satisfactory, with variation coefficients lower than 11%. For method 1, at the fortification level of 0.2 mg/L, recovery of PCP, TCP, and DCP was 112%, 74% and 45%, respectively. For method 2, the corresponding recovery values at the fortification level of 0.1 mg/L were 91%, 93% and 103%, respectively. Storage of the frozen samples did not alter their PCP determination properties. The chromatographic methods adapted for chlorophenol determination in wastewater were suitable with relatively simple manipulation techniques. The obtained results were reproducible and allowed identification of intermediates formed during the PCP degradation process.
authors.affiliation: Laboratório de Processos Biológicos, Escola de Engenharia de São Carlos, Universidade de São Paulo, São, Carlos-SP, Brazil.
authors.forename: Márcia H R Z
authors.initials: MH
authors.lastname: Damianovic
authors.forename: Flávia T
authors.initials: FT
authors.lastname: Saia
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Moraes
authors.forename: Diva
authors.initials: D
authors.lastname: Landgraf
authors.forename: Maria O O
authors.initials: MO
authors.lastname: Rezende
authors.forename: Rosana F
authors.initials: RF
authors.lastname: Vazoller
authors.forename: Eugênio
authors.initials: E
authors.lastname: Foresti
mesh_terms: D000089:Acetic Anhydrides / Q000737:chemistry*; D001421:Bacteria, Anaerobic / Q000502:physiology*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002733:Chlorophenols / Q000032:analysis* / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods*; D003978:Diazomethane / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D007700:Kinetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D000089:Acetic Anhydrides; D002733:Chlorophenols; D014874:Water Pollutants, Chemical; C031800:acetic anhydride; D003978:Diazomethane