title: Selective bioaccumulation and elimination of hexachlorocyclohexane isomers in Tubifex tubifex (Oligochaeta, Tubificidae).
abstract: In this study, Tubifex tubifex worms were exposed to sediment-associated hexachlorocyclohexane (HCH) isomers to study the bioaccumulation and elimination behaviors of HCH isomers in T. tubifex. During a 10-day bioaccumulation experiment, bioaccumulation curves of HCHs were approximate to M-type in T. tubifex. The enantioselective behaviors of α-HCH enantiomers were observed in T. tubifex, with concentrations of (+)-α-HCH higher than that of (-)-α-HCH. The concentration of γ-HCH in T. tubifex was higher than that of β-HCH and α-HCH. The existence of worms can accelerate the dissipation of HCHs in sediment, and the dissipation half-lives of α-HCH, β-HCH, and γ-HCH were 8.39, 23.90, and 3.10 days, respectively. In the elimination experiment, approximately 0.053 (37.1%), 0.074 (45.9%), and 0.042 mg/kgwwt (38.4%) α-HCH, β-HCH, and γ-HCH were depleted or excreted in T. tubifex on the first day, respectively. The body residues in T. tubifex were 0.084 (α-HCH), 0.082 (β-HCH), and 0.061 mg/kgwwt (γ-HCH) at the end of elimination experiment. Furthermore, the existence of T. tubifex could affect the overlying water quality parameters.
authors.affiliation: Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China.|Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Di
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China.
authors.forename: Ledan
authors.initials: L
authors.lastname: Huang
authors.affiliation: Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China.
authors.forename: Jinling
authors.initials: J
authors.lastname: Diao
authors.affiliation: Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China. zqzhou@cau.edu.cn.|Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing, 100193, China. zqzhou@cau.edu.cn.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhou
mesh_terms: D000818:Animals; D019659:Asteraceae; D004784:Environmental Monitoring; D001556:Hexachlorocyclohexane / Q000032:analysis / Q000378:metabolism*; D009835:Oligochaeta / Q000737:chemistry / Q000378:metabolism*; D013237:Stereoisomerism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane
keywords: Bioaccumulation; Dissipation; Elimination; HCHs; Sediment; Tubifex tubifex