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Time Trend Analysis of Atmospheric POPs Concentrations in the Great Lakes Region Since 1990

机译：1990年以来大湖区大气POPs浓度的时间趋势分析

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摘要

Using a multiple linear regression model of the concentrations of several persistent organic pollutants in the atmospheric vapor and particle phases and in precipitation, we have analyzed a data set of about 700,000 values to determine the rate at which these concentrations are decreasing. These concentrations were measured as part of the Integrated Atmospheric Deposition Network (IADN), which has operated several sites near the North American Great Lakes since 1991. The pollutants measured include 83 porychlorinated biphenyl congeners, 17 polycyclic aromatic hydrocarbons, and 24 organochlorine pesticides. In the approach used here, for each of the three phases, the concentrations of a specific chemical at all the sites were combined and fitted with a regression incorporating the sine and cosine of the Julian Day {relative to 1 January 1990 and with a periodicity of one year) and the population living and working within a 25-km radius of the sampling site. Partial residuals were then calculated for each datum, all of the residuals for the three phases were combined, and an overall halving time was calculated from them. This relatively simple approach indicated that the concentrations of PCBs in air around the Great Lakes are decreasing with an overall halving time of 17 ± 2 years, which is slow for a substance that was banned about 35 years ago. Phenanthrene, chrysene, and endosulfan showed halving times on the order of 10 years. The concentrations of several organochlorine pesticides were decreasing more rapidly; for example a-and γ-HCH (lindane) have halving times of about 3.5 years.
机译：使用对大气中的汽相和颗粒相以及降水中几种持久性有机污染物的浓度的多元线性回归模型，我们分析了大约700,000个值的数据集，以确定这些浓度的降低速率。这些浓度是作为综合大气沉积网络（IADN）的一部分进行测量的，该网络自1991年以来一直在北美五大湖附近的多个地点运营。所测量的污染物包括83种多氯联苯同源物，17种多环芳烃和24种有机氯农药。在此处使用的方法中，对于三个阶段中的每个阶段，都将所有站点上特定化学物质的浓度合并在一起，并进行回归，该回归包括儒略日的正弦和余弦（相对于1990年1月1日，周期为一年），以及在采样地点半径25公里之内居住和工作的人口。然后，针对每个基准计算部分残差，将三相的所有残差合并，然后从中计算出总的减半时间。这种相对简单的方法表明，五大湖周围空气中PCBs的浓度正在降低，总体减半时间为17±2年，这对于大约35年前被禁止的物质来说是缓慢的。菲，菊花和硫丹的减半时间约为10年。几种有机氯农药的浓度下降得更快。例如a-和γ-HCH（林丹）的减半时间约为3.5年。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8050-8055|共6页
  • 作者

    MARTA VENIER; RONALD A. KITES;

  • 作者单位

    School of Public and Environmental Affairs, Indiana University, Bloornington, Indiana 47405;

    rnSchool of Public and Environmental Affairs, Indiana University, Bloornington, Indiana 47405;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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