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首页> 外文期刊>Environmental Science & Technology >Hexabromocyclododecane in White-Sided Dolphins: Temporal Trend and Stereoisomer Distribution in Tissues
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Hexabromocyclododecane in White-Sided Dolphins: Temporal Trend and Stereoisomer Distribution in Tissues

机译：六面海豚中的六溴环十二烷：时间趋势和组织中的立体异构体分布。

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Hexabromocyclododecane (HBCD) is a brominated flame retardant used primarily in expanded polystyrene foams and other styrene resins. Samples of blubber (n = 57) and liver [n = 16) from Atlantic white-sided dolphins, Lagenorhynchus acutus, that stranded on the eastern coast of United States between 1993 and 2004 were obtained from the National Marine Mammal Tissue Bank (NMMTB). Blubber samples from most of these animals (n = 47) were previously analyzed for polybrominated diphenyl ethers (PBDE), polychlorinated biphenyls (PCB), and several toxaphene congeners. The three most abundant diastereomers in the technical HBCD mixture (α-HBCD, β-HBCD, and γ-HBCD) and their enantiomers were determined using liquid chromatography-triple quadrupole mass spectrometry (LC-MS/MS). α-HBCD was found in all blubber and liver samples while β-HBCD and γ-HBCD were not detected in any samples. The a-HBCD concentration in blubber and liver ranged from 14 ng/g wet mass (19 ng/g lipid) to 280 ng/g wet mass (380 ng/g lipid) and 0.051 ng/g wet mass (2.9 ng/g lipid) to 3.6 ng/g wet mass (140 ng/g lipid), respectively. Concentrations of a-HBCD were 2 to 3 orders of magnitude lower than previously reported PBDE, PCB, and toxaphene concentrations in these same animals. There was not a significant temporal trend for these compounds in white-sided dolphin blubber. The enantiomeric fractions (EF) measured in blubber and liver were not statistically different and ranged from 0.34 to 0.53. Blubber EFs were significantly correlated with both a-HBCD concentrations and white-sided dolphin body length. In general, concentrations of HBCDs were lower in these white-sided dolphins than in cetaceans from Western Europe.
机译：六溴环十二烷（HBCD）是一种溴化阻燃剂，主要用于膨胀聚苯乙烯泡沫塑料和其他苯乙烯树脂。 1993年至2004年之间滞留在美国东海岸的大西洋白面海豚Lagenorhynchus acutus的脂肪（n = 57）和肝脏[n = 16]的样本是从美国国家海洋哺乳动物组织银行（NMMTB）获得的。先前已对这些动物中大多数动物（n = 47）的橡胶样本进行了多溴联苯醚（PBDE），多氯联苯（PCB）和几种毒杀芬同源物的分析。使用液相色谱-三重四极杆质谱（LC-MS / MS）测定了工业HBCD混合物中三种最丰富的非对映异构体（α-HBCD，β-HBCD和γ-HBCD）及其对映异构体。在所有润滑脂和肝脏样品中均发现了α-六溴环十二烷，而在任何样品中均未检测到β-六溴环十二烷和γ-六溴环十二烷。润滑脂和肝脏中的a-六溴环十二烷浓度范围为14 ng / g湿重（19 ng / g脂质）至280 ng / g湿重（380 ng / g脂质）和0.051 ng / g湿重（2.9 ng / g）脂质）至3.6 ng / g湿重（140 ng / g脂质）。在这些相同的动物中，a-六溴环十二烷的浓度比以前报道的多溴二苯醚，多氯联苯和毒杀芬的浓度低2至3个数量级。这些化合物在白面海豚脂中没有明显的时间趋势。在润滑脂和肝脏中测得的对映体分数（EF）在统计学上没有差异，范围为0.34至0.53。橡胶EF与a-HBCD浓度和白面海豚体长均显着相关。通常，这些白面海豚中的六溴环十二烷浓度低于西欧的鲸类。

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