title: Anaerobic degradation of diethyl phthalate, di-n-butyl phthalate, and di-(2-ethylhexyl) phthalate from river sediment in Taiwan.
abstract: We investigated anaerobic degradation rates for three phthalate esters (PAEs), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), and di-(2-ethylhexyl) phthalate (DEHP), from river sediment in Taiwan. The respective anaerobic degradation rate constants for DEP, DBP, and DEHP were observed as 0.045, 0.074, and 0.027 1/day, with respective half-lives of 15.4, 9.4, and 25.7 days under optimal conditions of 30 degrees C and pH7.0. Anaerobic degradation rates were enhanced by the addition of the surfactants brij 35 and triton N101 at a concentration of 1 critical micelle concentration (CMC), and by the addition of yeast extract. Degradation rates were inhibited by the addition of acetate, pyruvate, lactate, FeCl3, MnO2, NaCl, heavy metals, and nonylphenol. Our results indicate that methanogen, sulfate-reducing bacteria, and eubacteria are involved in the degradation of PAEs.
authors.affiliation: Department of Microbiology, Soochow University, Shin Lin, Taipei, Taiwan 111, China. bvchang@mail.scu.edu.tw
authors.forename: B V
authors.initials: BV
authors.lastname: Chang
authors.forename: C S
authors.initials: CS
authors.lastname: Liao
authors.forename: S Y
authors.initials: SY
authors.lastname: Yuan
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000187:drug effects / Q000378:metabolism*; D001673:Biodegradation, Environmental; D003993:Dibutyl Phthalate / Q000032:analysis / Q000378:metabolism*; D004051:Diethylhexyl Phthalate / Q000032:analysis / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D019015:Geologic Sediments / Q000032:analysis* / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010795:Phthalic Acids / Q000032:analysis / Q000378:metabolism*; D045483:Rivers; D013501:Surface-Active Agents / Q000494:pharmacology; D013624:Taiwan; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D010795:Phthalic Acids; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D003993:Dibutyl Phthalate; D004051:Diethylhexyl Phthalate; C007379:diethyl phthalate