title: Biodegradation of phthalate esters in compost-amended soil.
abstract: In this study, we investigated the biodegradation of the phthalate acid esters (PAEs) di-n-butyl phthalate (DBP) and di-(2-ethyl hexyl) phthalate (DEHP) in compost and compost-amended soil. DBP (50 mg kg(-1)) and DEHP (50 mg kg(-1)) were added to the two types of compost (straw and animal manure) and subsequently added to the soil; they were tested as a single compound and in combination. Optimal PAE degradation in soil was at pH 7 and 30 degrees C. The degradation of PAE was enhanced when DBP and DEHP were simultaneously present in the soil. The addition of either of the two types of compost individually also improved the rate of PAE degradation. Compost samples were separated into fractions with various particle size ranges, which spanned from 0.1-0.45 to 500-2000 microm. We observed that the compost fractions with smaller particle sizes demonstrated higher PAE degradation rates. When the different compost fractions were added to soil, however, compost particle size had no significant effect on the rate of PAE degradation.
authors.affiliation: Department of Microbiology, Soochow University, Shih Lin, Taipei 111, Taiwan. bvchang@mail.scu.edu.tw
authors.forename: B V
authors.initials: BV
authors.lastname: Chang
authors.forename: Y S
authors.initials: YS
authors.lastname: Lu
authors.forename: S Y
authors.initials: SY
authors.lastname: Yuan
authors.forename: T M
authors.initials: TM
authors.lastname: Tsao
authors.forename: M K
authors.initials: MK
authors.lastname: Wang
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D003993:Dibutyl Phthalate / Q000737:chemistry; D004952:Esters / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010316:Particle Size; D010795:Phthalic Acids / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013696:Temperature
chemical_list: D004952:Esters; D010795:Phthalic Acids; D012987:Soil; D003993:Dibutyl Phthalate; C032279:phthalic acid