title: Influence of nutrient level on biodegradation and bioconcentration of phthalate acid esters in Chlorella vulgaris.
abstract: Influences of major nutrients (N, P) on the biodegradation and bioconcentration of dibutyl phthalate (DBP) and di-2-ethylexyl phthalate (DEHP) by Chlorella vulgaris in lake water were investigated in this work. Our study demonstrated that nutrient addition obviously influenced biodegradation rate constants and apparent bioconcentration factors (BCFs) of DBP and DEHP in Chlorella vulgaris. The effects of P addition on biodegradation were less pronounced than the effects of N addition as a result of N-limitation status of phytoplankton in the lake water, while addition of both N and P more greatly affected biodegradation than addition of N or P. BCFs of DBP and DEHP decreased with increasing algal exudate as measured by dissolved organic carbon (DOC) and a strong correlation between BCFs and DOC was obtained. The results indicate that DOC plays an important role in the bioconcentration of DBP and DEHP.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin, China. cjiechi@yahoo.com
authors.forename: Jie
authors.initials: J
authors.lastname: Chi
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Qian Y
authors.initials: QY
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
mesh_terms: D001673:Biodegradation, Environmental; D048408:Chlorella vulgaris / Q000378:metabolism*; D003993:Dibutyl Phthalate / Q000032:analysis / Q000378:metabolism; D004051:Diethylhexyl Phthalate / Q000032:analysis / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000032:analysis; D010795:Phthalic Acids / Q000032:analysis / Q000378:metabolism*
chemical_list: D010795:Phthalic Acids; D003993:Dibutyl Phthalate; C032279:phthalic acid; D004051:Diethylhexyl Phthalate