title: Hexabromocyclododecane diastereoisomers in surface sediments from river drainage basins of Shanghai, China: occurrence, distribution, and mass inventory.
abstract: Concentrations of hexabromocyclododecanes (HBCDs) were determined in surface sediments of Shanghai, China. The concentrations of total HBCD diastereoisomers (ΣHBCD) ranged from 0.01 to 13.70 ng g(-1) dry weight (dw) with a mean value of 3.41 ng g(-1) dw, which was up to several orders of magnitude lower than those reported for sediments from European countries. The ΣHBCD concentrations in sediments from chemical/textile industrial or densely populated areas were generally higher than those from rural or less chemical/textile industrialized areas in Shanghai. A high proportion of α-HBCD was observed in sediment samples and was significantly higher than that of commercial HBCD products. This might be due to thermal isomerization from γ-HBCD to α-HBCD and slower degradation rate of α-HBCD compared to γ-HBCD in anaerobic conditions. The mass inventory of ΣHBCD in surface sediments of Shanghai was estimated at 164.4 kg, representing a significant source of HBCDs to the Shanghai environment. This indicates that further study on potential transfer of HBCDs from sediments to aquatic organisms and ecological risk assessments is required.
authors: Institute of Applied Radiation of Shanghai, Shanghai University, Shanghai, 201800, People's Republic of China.
authors: Liang
authors: L
authors: Tang
authors: Hai-Yang
authors: HY
authors: Shao
authors: Jian-Yao
authors: JY
authors: Zhu
authors: Gang
authors: G
authors: Xu
authors: Tao
authors: T
authors: Han
authors: Bing-Quan
authors: BQ
authors: Peng
authors: Ming-Hong
authors: MH
authors: Wu
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006842:Hydrocarbons, Brominated / Q000032:analysis* / Q000737:chemistry; D045483:Rivers / Q000737:chemistry*; D013237:Stereoisomerism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D006842:Hydrocarbons, Brominated; D014874:Water Pollutants, Chemical; C089796:hexabromocyclododecane