Atmospheric Concentrations of PCB-11 Near the Great Lakes Have Not Decreased Since 2004,Environmental Science & Technology Letters

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Atmospheric Concentrations of PCB-11 Near the Great Lakes Have Not Decreased Since 2004
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-02-21 00:00:00 , DOI: 10.1021/acs.estlett.8b00019
Ronald A. Hites ₁

Affiliation

3,3′-Dichlorobiphenyl (PCB-11) is thought to be a byproduct of the production of yellow pigments, and thus, it has sources to the environment that differ both in type and magnitude compared to the PCBs that made up the, now banned, Aroclor commercial products. To assess these differences, the temporal trends of atmospheric concentrations of PCB-11 relative to those of 31 specific Aroclor-related congeners and relative to those of total Aroclor-PCBs at six sites near the North American Great Lakes were investigated. About 1800 atmospheric samples were collected over the period of 2004–2015 (inclusive). A multiple linear regression approach was used to isolate the variations in the atmospheric concentrations due to the human population near the sampling sites, seasonal effects, and long-term temporal changes. The atmospheric concentrations of the Aroclor-PCBs are decreasing with halving times of about 12 years, but the atmospheric concentrations of PCB-11 have not changed significantly over this time period. These results suggest that PCB-11 is still leaking into the environment, while at the same time sources of Aroclor-PCBs are coming under control. This effect is particularly notable at the most remote site on Lake Superior, where PCB-11 levels are, on average, 11% of those of total Aroclor-PCBs; this is a not insignificant abundance of a single PCB congener.

中文翻译：

自2004年以来，五大湖附近的PCB-11大气浓度并未降低

3,3'-二氯联苯（PCB-11）被认为是黄色颜料生产的副产品，因此，与构成现在的PCBs相比，其来源和环境来源在类型和大小上都不同。禁止使用Aroclor商业产品。为了评估这些差异，研究了北美十一大湖附近六个地点相对于31种特定的Aroclor相关同源物和相对于总Aroclor-PCBs的PCB-11大气浓度的时间趋势。在2004-2015年（含）期间，收集了大约1800个大气样品。多元线性回归方法用于隔离由于采样地点附近的人口，季节影响和长期时间变化引起的大气浓度变化。Aroclor-PCBs的大气浓度随着大约12年的减半时间而降低，但是PCB-11的大气浓度在这段时间内没有显着变化。这些结果表明，PCB-11仍在泄漏到环境中，与此同时，Aroclor-PCB的来源正在受到控制。这种效果在苏必利尔湖最偏远的地方尤为明显，那里的PCB-11含量平均为Aroclor-PCB总量的11％。这与单个PCB同类产品的数量并不无关紧要。同时，Aroclor-PCB的来源正在受到控制。这种效果在苏必利尔湖最偏远的地方尤为明显，那里的PCB-11含量平均为Aroclor-PCB总量的11％。这与单个PCB同类产品的数量并不无关紧要。同时，Aroclor-PCB的来源正在受到控制。这种效果在苏必利尔湖最偏远的地方尤为明显，那里的PCB-11含量平均为Aroclor-PCB总量的11％。这与单个PCB同类产品的数量并不无关紧要。

更新日期：2018-02-21

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