我们对环境行为的理解,在北极环境中的氯化石蜡(CPs)和十氯甲烷(12月)的生物累积和浓度仍然有限,特别是在淡水生态系统中。在这项描述性研究中,短链(SCCP)和中链(MCCP)CP,十氯烷加(DP)和类似物,并在沉积物中测量了多氯联苯(PCBs),底栖生物,三刺棘背(Gasterosteusaculeatus),挪威北部两个亚北极湖泊中的北极炭(Salvelinusalpinus)和棕鳟鱼(Salmotrutta)。塔克万内(TA)是一个偏远的湖泊,当地没有已知的有机污染物来源,而Storvannet(ST)位于人口稠密的地区。在ST的所有沉积物样品中检测到短链氯化石蜡和中链氯化石蜡,其浓度为42.26-115.29ng/gdw,短链氯化石蜡和中链氯化石蜡的浓度为66.18-136.69ng/gdw,分别。在TA沉积物中仅检测到短链氯化石蜡(0.4-5.28ng/gdw)。在生物群样本中,刺鲸和底栖生物显示出最高的CP浓度,而炭和鳟鱼的浓度都很低或低于检测限。在两个湖泊中观察到的同类物组模式显示,SCCP谱由较高的氯化同类物组主导,而MCCP在其谱中显示出一致性,C14是最普遍的碳链长度。在所有沉积物中均检测到反-和顺-DP异构体,ST中的底栖和stickleback样品的浓度高于TA。然而,它们仅存在于ST的一些炭和鳟鱼样品中。在两个湖泊中的所有样品中,Dec601和604均低于检测限。仅在ST沉积物中检测到12月603,棘鱼和2条鳟鱼样本,而Dec602是在两个湖泊的所有样品中发现的唯一DP类似物。虽然ST和TA之间的DP和12月602的沉积物浓度存在明显差异,湖泊之间的差异随着δ15N的增加而减小。这种模式类似于PCB的行为,这表明ST中的湖泊特征在该湖泊中缺乏污染物的生物放大作用中起着重要作用。我们的结果表明,除大气传输外,ST还从当地来源接收污染物。
Our understanding of the environmental behavior, bioaccumulation and concentrations of chlorinated paraffins (CPs) and Dechloranes (Dec) in the Arctic environment is still limited, particularly in freshwater ecosystems. In this descriptive study, short chain (SCCPs) and medium chain (MCCPs) CPs, Dechlorane Plus (DP) and analogues, and polychlorinated biphenyls (PCBs) were measured in sediments, benthic organisms, three-spined stickleback (Gasterosteus aculeatus), Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in two Sub-Arctic lakes in Northern Norway. Takvannet (TA) is a remote lake, with no known local sources for organic contaminants, while Storvannet (ST) is situated in a populated area. SCCPs and MCCPs were detected in all sediment samples from ST with concentration of 42.26-115.29 ng/g dw and 66.18-136.69 ng/g dw for SCCPs and MCCPs, respectively. Only SCCPs were detected in TA sediments (0.4-5.28 ng/g dw). In biota samples, sticklebacks and benthic organisms showed the highest concentrations of CPs, while concentrations were low or below detection limits in both char and trout. The congener group patterns observed in both lakes showed SCCP profiles dominated by higher chlorinated congener groups while the MCCPs showed consistency in their profiles, with C14 being the most prevalent carbon chain length. Anti- and syn-DP isomers were detected in all sediment, benthic and stickleback samples with higher concentrations in ST than in TA. However, they were only present in a few char and trout samples from ST. Dec 601 and 604 were below detection limits in all samples in both lakes. Dec 603 was detected only in ST sediments, sticklebacks and 2 trout samples, while Dec 602 was the only DP analogue found in all samples from both lakes. While there were clear differences in sediment concentrations of DP and Dec 602 between ST and TA, differences between lakes decreased with increasing δ15N. This pattern was similar to the PCB behavior, suggesting the lake characteristics in ST are playing an important role in the lack of biomagnification of pollutants in this lake. Our results suggest that ST receives pollutants from local sources in addition to atmospheric transport.