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Polychlorinated biphenyls and other organochlorine compounds in marine zooplankton off the east coast of Newfoundland, Canada

机译:加拿大纽芬兰东海岸外海浮游动物中的多氯联苯和其他有机氯化合物

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摘要

Marine zooplankton samples collected in 1993 and 1994 at 25 stations along the east coast of Newfoundland and Labrador were analyzed for polychlorinated biphenyls (PCBs) and persistent organochlorine (OC) compounds. Concentrations of these compounds were low ( < 1 ng/g wet weight). A few tnchloro-, tetrachloro- and pentachlorobiphenyl congeners were detected in zooplankton. Hexachlorobenzene (HCB), α-hexachlorocyclohexane (αHCH) and some components of technical chlordane were also detected in the samples. Dichloro- dichlorophenylethylene (DDE) and Dichlorodiphenyltnchloroethane (DDT) were consistently present in zooplankton at approximately equal concentrations. Analysis of variance with data calculated on either a wet weight or a lipid-normalized basis indicated that there were no significant differences in contaminant concentrations that could be attributed to sampling year or to the towing methods used to collect samples. Principal component analysis (PCA) of analytical data indicated that there were no spatial trends evident in either the concentrations or patterns of contamination. The patterns of PCB and OC contamination are consistent with the patterns previously reported in zooplankton from the Arctic. The concentrations of trace contaminants reported in this study are well below the concentrations reported for North Atlantic zooplankton sampled in the 1970s.
机译:对1993年和1994年在纽芬兰和拉布拉多东海岸25个站点采集的海洋浮游动物样品进行了多氯联苯(PCBs)和持久性有机氯(OC)化合物分析。这些化合物的浓度很低(<1 ng / g湿重)。在浮游动物中发现了一些三氯联苯,四氯联苯和五氯联苯同类物。样品中还检测到六氯苯(HCB),α-六氯环己烷(αHCH)和工业用氯丹的某些成分。在浮游动物中,二氯二氯苯基乙烯(DDE)和二氯二苯基三氯乙烷(DDT)始终以近似相等的浓度存在。使用以湿重或脂质归一化为基础计算的数据进行方差分析表明,污染物浓度没有显着差异,这可以归因于取样年份或用于收集样品的拖曳方法。分析数据的主成分分析(PCA)表明,污染物的浓度或模式均无明显的空间趋势。 PCB和OC污染的模式与北极地区浮游动物先前报道的模式一致。该研究报告的痕量污染物浓度远低于1970年代采样的北大西洋浮游动物的浓度。

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