Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, NJ, 08901, USA.
Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, NJ, 08901, USA.
Chemosphere. 2020 Nov;259:127438. doi: 10.1016/j.chemosphere.2020.127438. Epub 2020 Jun 18.
The Upper Hudson River (UHR) has been contaminated with polychlorinated biphenyls (PCBs) since the 1940s due to the manufacture of capacitors at two plants near Hudson Falls and Fort Edward, NY by General Electric (GE). Dredging of portions of the UHR was conducted from 2009 to 2015 as a partial remedy for this contamination. In 2017, the New York State Department of Environmental Conservation undertook a comprehensive post-dredging survey of sediment contamination in the UHR. Thousands of samples were collected, and 130 of these were analyzed for PCBs using EPA method 1668A. This data set was analyzed using Positive Matrix Factorization. Six factors were observed. One factor resembled the dominant Aroclors used by GE with little alteration. Three factors represented different pathways and/or extents of microbial dechlorination. One factor resembled a mixture of microbial dechlorination products and a higher molecular weight Aroclor used by GE. The congener patterns of the dechlorination factors suggest that removal of chlorines at the ortho position does occur in the UHR sediment, in agreement with several laboratory studies showing that such ortho dechlorination is possible. This ortho dechlorination could theoretically lead to complete dechlorination of PCBs to biphenyl in UHR sediment. Only one factor was not attributable to GE. It represents inputs of PCBs from tributaries and urban areas and explains 1.7% of the PCB mass in the sediments. The small contribution from the non-GE PCB source suggests that recontamination of the sediment after dredging was minor.
哈德逊河上游（UHR）自 20 世纪 40 年代以来就受到多氯联苯（PCBs）的污染，这是由于纽约州哈德逊福尔斯和爱德华堡附近的两家通用电气（GE）工厂制造电容器造成的。作为对此污染的部分补救措施，2009 年至 2015 年对 UHR 的部分河段进行了疏浚。2017 年，纽约州环境保护部对 UHR 沉积物污染进行了全面的疏浚后调查。采集了数千个样本，其中 130 个样本使用 EPA 方法 1668A 分析了 PCBs。该数据集使用正矩阵因子化进行了分析。观察到六个因素。一个因素与通用电气使用的主要 Aroclors 相似，几乎没有改变。三个因素代表了不同的途径和/或微生物脱氯的程度。一个因素类似于微生物脱氯产物的混合物和通用电气使用的高分子量 Aroclor。脱氯因子的同系物模式表明，在 UHR 沉积物中确实会发生邻位氯的去除，这与几项实验室研究一致，表明这种邻位脱氯是可能的。这种邻位脱氯理论上可以导致 UHR 沉积物中 PCB 完全脱氯生成联苯。只有一个因素不能归因于通用电气。它代表了支流和城市地区 PCBs 的输入，占沉积物中 PCB 质量的 1.7%。非通用电气 PCB 源的贡献较小表明疏浚后沉积物的再污染较小。
