大湖地区降水持久性有机污染物浓度的时间变化趋势。
Temporal trends of persistent organic pollutant concentrations in precipitation around the Great Lakes.
机构信息
School of Public and Environmental Affairsm, Indiana University, Bloomington, IN 47405, USA.
School of Public and Environmental Affairsm, Indiana University, Bloomington, IN 47405, USA.
出版信息
Environ Pollut. 2016 Oct;217:143-8. doi: 10.1016/j.envpol.2016.01.034. Epub 2016 Feb 10.
The concentrations of polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and several chlorinated insecticides in precipitation have been measured in samples collected every month since 1997 at six sites on the shores of the North American Great Lakes. We report here the geometric mean concentrations for each of these compounds for each year and at each site. Assuming a first-order rate decline for these data, we have calculated the time it takes for these concentrations to decrease by half. The halving times are not statistically distinguishable among the sites. Overall, the observed halving times are 11 ± 2 years for the PCBs, 14 ± 3 years for the PAHs, 4.0 ± 0.2 for the hexachlorocyclohexanes, 8.0 ± 0.9 for the DDTs, 5.1 ± 0.8 for the chlordanes, and 8.4 ± 0.6 for the endosulfans. In general, the halving times calculated from precipitation concentrations agree with those calculated from atmospheric vapor and particle phase concentrations.
自 1997 年以来，在北美五大湖沿岸的六个地点，每月采集降水样本，测量其中多氯联苯（PCBs）、多环芳烃（PAHs）和几种氯化杀虫剂的浓度。我们在此报告这些化合物在每年每个地点的几何平均浓度。根据这些数据的一阶速率下降假设，我们计算了这些浓度减半所需的时间。这些减半时间在各地点之间没有统计学差异。总体而言，PCBs 的观测减半时间为 11 ± 2 年，PAHs 为 14 ± 3 年，六氯环己烷为 4.0 ± 0.2 年，DDTs 为 8.0 ± 0.9 年，氯丹为 5.1 ± 0.8 年，硫丹为 8.4 ± 0.6 年。一般来说，从降水浓度计算得出的减半时间与从大气蒸气和颗粒相浓度计算得出的减半时间一致。
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