The occurrence and distribution of 11 organochlorine pesticides (OCPs) and their degradation products as well as of 17 polychlorinated biphenyl congeners (PCBs) were investigated for the first time in sediments of three (Lake Prošće, Lake Kozjak, Lake Kaluđerovac) out of 16 cascading karst lakes within the protected area of the Plitvice Lakes National Park in central Croatia. The 15-cm-long sediment cores were divided for analysis into three 5-cm-long segments. The abundance and levels of sediment-associated OCPs and PCBs were evaluated with respect to sampling location and sediment depth, presumed age of deposition, and organic carbon content. The burden of sediments with OCPs and PCBs decreased downstream with the highest mass fractions measured in the uppermost Lake Prošće (total OCPs 2.72-5.86 μg kg-1 d.m., total PCBs 0.37-1.78 µg kg-1 d.m.) and the lowest in Lake Kaluđerovac (total OCPs 0.30-0.58 μg kg-1 d.m., total PCBs 0.07-0.12 µg kg-1 d.m.). The predominant organochlorine pollutants were DDT-type compounds (total DDX, w = 0.30-5.72 µg kg-1 d.m.) with p,p'-DDE and p,p'-DDD accounting for up to 100% and 50%, respectively, of the total DDX. The findings indicated an old input of p,p'-DDT that largely converted to its degradation products. The OCP and PCB mass fractions in the Plitvice lake sediments were at trace levels characteristic for preserved pristine natural environments with no or limited anthropogenic impact wherein long-range atmospheric transport is considered as their main source.

中文翻译：

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十六湖国家公园（克罗地亚）湖沉积物中的有机氯农药和多氯联苯残留物的分布。

首次调查了16种级联反应中的三种沉积物（普罗什奇湖，科兹贾克湖，卡卢罗维瓦克湖）的沉积物中11种有机氯农药（OCP）及其降解产物以及17种多氯联苯同源物（PCBs）的发生和分布克罗地亚中部十六湖国家公园保护区内的喀斯特湖。将15厘米长的沉积物芯分成三个5厘米长的段进行分析。评估了与沉积物有关的OCP和PCB的丰度和水平，包括采样位置和沉积物深度，假定的沉积年龄以及有机碳含量。下游具有OCP和PCBs的沉积物负担减少，质量分数在最高的普罗西奇湖中最高（总OCPs为2.72-5.86μgkg-1 dm，PCBs总量为0.37-1.78 µg kg-1 dm ），而在Kaluđerovac湖中最低（总OCP值为0.30-0.58μgkg-1 dm，PCB总量为0.07-0.12μgkg-1 dm）。主要的有机氯污染物为DDT型化合物（总DDX，w = 0.30-5.72 µg kg-1 dm），其中p，p'-DDE和p，p'-DDD分别占100％和50％。 DDX的总数。研究结果表明，p，p'-DDT的输入很旧，大部分已转化为其降解产物。十六湖沉积物中的OCP和PCB质量分数处于痕量水平，是原始自然环境的保留特征，没有或没有人为影响，其中远距离大气迁移被认为是其主要来源。主要的有机氯污染物为DDT型化合物（总DDX，w = 0.30-5.72 µg kg-1 dm），其中p，p'-DDE和p，p'-DDD分别占100％和50％。 DDX的总数。研究结果表明，p，p'-DDT的输入很旧，大部分已转化为其降解产物。十六湖沉积物中的OCP和PCB质量分数处于痕量水平，是原始自然环境的保留特征，没有或没有人为影响，其中远距离大气迁移被认为是其主要来源。主要的有机氯污染物为DDT型化合物（总DDX，w = 0.30-5.72 µg kg-1 dm），其中p，p'-DDE和p，p'-DDD分别占100％和50％。 DDX的总数。研究结果表明，p，p'-DDT的输入很旧，大部分已转化为其降解产物。十六湖沉积物中的OCP和PCB质量分数处于痕量水平，是原始自然环境的保留特征，没有或没有人为影响，其中远距离大气迁移被认为是其主要来源。