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Environmental Contaminants in Tissues of a Neonate St Lawrence Beluga Whale (Delphinaptevus leucas)

机译:新生圣劳伦斯白鲸(Delphinaptevus leucas)的组织中的环境污染物

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Tissue samples of brain, kidney, liver, and blubber from a neonate St Lawrence beluga whale were analyzed for ortho and non-ortho polychlorinated (PCB) congeners, organochlorine (OC) compounds, polychlorinated di-benzo-p-dioxins and -dibenzofurans (PCDD/Fs), and total mercury. As γ-globulins, which indicate presence of colostrum, were not found in serum of the live neonate, it was unlikely that there had been lactational transfer of environmental contaminants to the neonate. No PCDFs were detected. Of the PCDD congeners, only OCDD was found in all tissues; ranging from 12 pg g~(-1) lipid in brain to 1138 pg g~(-1) in liver. Concentrations of ΣPCB (sum of 25 ortho and 4 non-ortho PCBs) and ΣDDT were lowest in brain (1.7 and 0.7 μg g~(-1) lipid, respectively), intermediate in kidney (4.1 and 2.3 μg g~(-1)) and highest in liver (8.8 and 3.5 μg g~(-1)) and blubber (17.6 and 2.2 μg g~(1)). PCB 126 was the predominant non-ortho congener. Toxic equivalent 2,3,7,8-TCDD concentrations (TEQs) (pg g~(-1) lipid) were: mono-ortho PCBs > non-ortho PCBs > PCDDs. Major individual OC compounds were DDE, HCB, oxychlordane and cis-nonachlor. Similar PCB and OC patterns were found for different tissues, with the exception of α-HCH in brain. Total mercury was detected in liver, kidney and brain at concentrations of 49-145 ng g~(-1) (wet weight). Concentrations of PCBs, OCs, and mercury in the neonate were lower than or in the lower range of those found in published data on female adult beluga whales of the St Lawrence, and this is probably due to absence of lactational transfer of contaminants in the neonate. Proportions of lower chlorinated PCBs, HCB, and HCH compounds were greater in the neonate than in these female whales, which may indicate preferen- tial gestational transfer of these compounds.
机译:分析了来自新生圣劳伦斯白鲸的大脑,肾脏,肝脏和脂肪的组织样本中的邻位和非邻位多氯联苯(PCB)同类物,有机氯(OC)化合物,多氯二苯并-p-二恶英和-二苯并呋喃( PCDD / Fs)和总汞。由于在新生婴儿的血清中未发现指示初乳存在的γ球蛋白,因此不太可能发生环境污染物向新生婴儿的泌乳转移。未检测到PCDF。在PCDD同源物中,在所有组织中仅发现OCDD;而在所有组织中均未发现OCDD。从脑中的脂质12 pg g〜(-1)到肝脏的1138 pg g〜(-1)不等。 ΣPCB(25个邻位和4个非邻位PCB的总和)和ΣDDT的浓度在脑中最低(分别为1.7和0.7μgg〜(-1)脂质),在肾脏中居中(4.1和2.3μgg〜(-1) )),最高的是肝脏(8.8和3.5μgg〜(-1))和脂肪(17.6和2.2μgg〜(1))。 PCB 126是主要的非正交同源物。毒性当量2,3,7,8-TCDD浓度(pg g〜(-1)脂质)为:单原位PCB>非原位PCB> PCDDs。单个的主要OC化合物是DDE,HCB,氧氯丹和顺式六氯丹。除大脑中的α-六氯环己烷外,不同组织的PCB和OC模式相似。在肝,肾和脑中检测到的总汞浓度为49-145 ng g〜(-1)(湿重)。新生儿中PCBs,OCs和汞的浓度低于或低于圣劳伦斯成年雌性成年鲸的公开数据中的含量,这可能是由于新生儿中没有乳酸的污染物转移引起的。新生儿中较低氯含量的PCB,HCB和HCH化合物的比例要比这些雌鲸更大,这可能表明这些化合物的优先妊娠转移。

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