title: Enhanced biotransformation of DDTs by an iron- and humic-reducing bacteria Aeromonas hydrophila HS01 upon addition of goethite and anthraquinone-2,6-disulphonic disodium salt (AQDS).
abstract: A fermentative facultative anaerobe, strain HS01 isolated from subterranean sediment, was identified as Aeromonas hydrophila by 16S rRNA sequence analysis. The biotransformation of 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (DDT), 1,1-dichloro-2,2-bis(4-chlorophenyl) ethylene (DDD), and 1,1-dichloro-2,2-bis (4-chlorophenyl) ethane (DDE) by HS01 was investigated in the presence of goethite and anthraquinone-2,6-disulphonic disodium salt (AQDS). The results demonstrated that HS01 was capable of reducing DDTs, goethite and AQDS. And goethite can significantly enhance the reduction of DDT, DDD and DDE to some extent, while the addition of AQDS can further accelerate the reduction of Fe(III) and DDTs. The products of DDT transformation were identified as a large amount of dominant DDD, and small amounts of 1-chloro-2,2-bis-(p-chlorophenyl)ethane (DDMU), unsym-bis(p-chlorophenyl)-ethylene (DDNU), and 4,4'-dichlorobenzophenone (DBP). The results of cyclic voltammetry suggested that AQDS could increase the amounts of reactive biogenic Fe(II), resulting in the enhanced transformation of DDTs. This investigation gives some new insight in the fate of DDTs related to iron- and humic-reducing bacteria.
authors.affiliation: Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Cao
authors.forename: Tong Xu
authors.initials: TX
authors.lastname: Liu
authors.forename: Chun Yuan
authors.initials: CY
authors.lastname: Wu
authors.forename: Fang Bai
authors.initials: FB
authors.lastname: Li
authors.forename: Xiao Min
authors.initials: XM
authors.lastname: Li
authors.forename: Huan Yun
authors.initials: HY
authors.lastname: Yu
authors.forename: Hui
authors.initials: H
authors.lastname: Tong
authors.forename: Man Jia
authors.initials: MJ
authors.lastname: Chen
mesh_terms: D016980:Aeromonas hydrophila / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D000880:Anthraquinones / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001711:Biotransformation; D003634:DDT / Q000378:metabolism*; D019015:Geologic Sediments / Q000382:microbiology*; D006812:Humic Substances / Q000032:analysis; D007501:Iron / Q000378:metabolism*; D058085:Iron Compounds / Q000378:metabolism*; D008903:Minerals / Q000378:metabolism*; D010084:Oxidation-Reduction
chemical_list: D000880:Anthraquinones; D006812:Humic Substances; D058085:Iron Compounds; D008903:Minerals; C408124:anthraquinone-2,6-disulfonate; C094886:goethite; D003634:DDT; D007501:Iron