Total PCB concentrations in sediment, water, macroinvertebrates and spiders and the lower Ottawa River (Toledo, OH) between 2009-2015

Polychlorinated biphenyl (PCB) concentrations were measured in the lower Ottawa River in 2009 before dredging and after dredging in 2011, 2012, 2013, and 2015. Media collected for analysis included sediment, water, macroinvertebrates, and tetragnathid spiders at 18 stations. At each station 16 surface sediment core samples (top 15 cm) were collected and composited together with a mechanical mixer to achieve a homogeneous composite sample. Mid-depth water column samples were collected using a Van Dorn, Niskin or similar type sampler. Artificial substrate samplers (Hester Dendys) were used to collect aquatic macroinvertebrates. Riparian spiders (family Tetragnathidae) were collected from their webs by gloved hand at night within 1 meter of the shoreline at each sampling station. All extracts were analyzed for 121 PCB congeners via gas chromotography mass spectroscopy in the selected ion monitoring mode based on U.S. EPA Method 1668A and quantified using the method of internal standards.

本数据集针对下渥太华河的多氯联苯（Polychlorinated Biphenyl, PCB）浓度开展测定，采样时间覆盖2009年疏浚作业前，以及2011、2012、2013与2015年疏浚作业后。本次分析的采样介质涵盖沉积物、水体、水生大型底栖无脊椎动物以及肖峭科蜘蛛，共设置18个采样点。每个采样点采集16份表层沉积物岩心样品（采集深度为表层0-15 cm），随后通过机械搅拌器将其混合均质，制备得到均质复合样品。中层水柱水样采用范多恩（Van Dorn）采水器、尼斯金（Niskin）采水器或同类采样设备采集。水生大型底栖无脊椎动物通过人工基质采样器（Hester Dendys）采集。在每个采样点岸线周边1米范围内，于夜间佩戴手套从蛛网中采集河岸带肖峭科蜘蛛。所有样品提取物均依据美国环境保护署（U.S. EPA）方法1668A，采用气相色谱-质谱联用选择离子监测模式，针对121种多氯联苯同系物进行分析，并以内标法完成定量。