Abstract：
The contamination status on persistent organic pollutants (POPs) in the Croatian terrestrial ecosystem was investigated by analyzing two classes of contaminants in adipose tissue of male European brown bear (Ursus arctos, N = 27) collected in 2021 and 2022. In addition to seven indicator polychlorinated biphenyls (PCBs), for the first time seven polybrominated diphenyl ethers (PBDEs) were analyzed in terrestrial species from this region. Sum of mass fractions detected in adipose tissue ranged from 0.011 to 0.463 ng g-1 lipid weight (lw) for the PBDEs, and from 0.652 to 30.17 ng g-1 lw for PCBs, with two orders of magnitude difference in the median value for these two groups of POPs (PBDEs: 0.022 ng g-1 lw; PCBs: 2.307 ng g-1 lw). PCBs dominated over PBDEs with a share of over 94 % of the total mass fractions of both groups of analyzed POPs. Results of the comparison of the PCB levels in the adipose tissue of brown bears reported here and in previous investigation from this region showed decrease in PCB-28, but increase of PCB-118 and PCB-180, while other congeners seemed to have reached a steady-state level in the environment over a ten-year period. Among the compounds analyzed in this study, BDE-47, PCB-153 and PCB-180 were the dominant congeners. Somewhat higher sum of PCBs was measured in April compared to October, although not statistically significant, indicating possible impact of winter hibernation causing concentration of lipophilic compounds due to body fat loss. Revealed POP levels in brown bears are consistent with the data on the low contamination of the Croatian terrestrial ecosystem in general.
摘要：
通过分析欧洲雄性棕熊（Ursusarctos，N=27）在2021年和2022年收集。除了七种指示性多氯联苯（PCB），首次分析了该地区陆地物种中的7种多溴联苯醚（PBDEs）。在脂肪组织中检测到的多溴二苯醚的质量分数总和为0.011至0.463ngg-1脂质重量(lw)，多氯联苯从0.652到30.17ngg-1lw，这两组持久性有机污染物的中值有两个数量级的差异(多溴二苯醚：0.022ngg-1lw；多氯联苯：2.307ngg-1lw)。多氯联苯在多溴二苯醚中占主导地位，占两组所分析持久性有机污染物总质量分数的94%以上。此处报道的棕熊脂肪组织中PCB水平的比较结果以及该地区先前的调查显示，PCB-28减少，但PCB-118和PCB-180增加，而其他同类物似乎已达到十年来环境中的稳态水平。在这项研究中分析的化合物中，BDE-47、PCB-153和PCB-180是主要同源物。与10月份相比，4月份测得的多氯联苯总量略高，虽然没有统计学意义，表明冬季冬眠可能导致体内脂肪流失导致亲脂性化合物浓度的影响。棕熊中显示的POP水平与克罗地亚陆地生态系统总体污染低的数据一致。
