Occurrence of C10–C13 polychlorinated n-alkanes in the atmosphere of the United Kingdom
Occurrence of C10–C13 polychlorinated n-alkanes in the atmosphere of the United Kingdom
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DOI：
10.1016/s1352-2310(99)00479-3
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发表时间：
2000
影响因子：
5
通讯作者：
Andrew J. Peters;Gregg T. Tomy;Kevin C. Jones;P. Coleman;G. Stern
中科院分区：
文献类型：
--
作者：
Andrew J. Peters;Gregg T. Tomy;Kevin C. Jones;P. Coleman;G. Stern
在联合王国的空气中，在12个月的时间里，每隔2周测量一次短链（C10-C13）多氯正构烷烃。采样期间PCA的平均浓度为320±320 pgm−3（算术平均值±1 S.D.）几何平均值为160 pgm −3。六氯化和七氯化十二烷同系物是联合王国大气中主要的五氯苯甲醚成分。对气相和颗粒相五氯苯甲醚的分析表明，大气中95%的五氯苯甲醚含量都在气相中。没有观察到季节性趋势或对温度的依赖。数据可分为两个显著不同（P<0.01）的群体：一组发生率较低浓度为150± 110 pgm − 3，另一组发生率较高浓度为800± 170 pgm −3。浓度升高的发生率可能与气温升高或所用时间尺度上的其他气象因素无关，这表明英国大气中五氯苯甲醚浓度可能主要是受污染空气团的对流输送和/或区域主要点源向环境中的释放的偶发性发生率，而不是温度相关的输送过程。英国大气中的五氯苯甲醚水平与加拿大半农村地区的数值相似，至少比加拿大北极大气中的数值高一个数量级。这些数据是对大气中五氯苯甲醚存在情况的首次详细研究，并表明五氯苯甲醚可能是大气中持久性有机污染物负荷的一个主要组成部分，有可能经历远距离大气迁移过程。
Short-chain (C10–C13) polychlorinated n-alkanes (PCAs) have been measured in the air in the United Kingdom at 2 week intervals over a period of 12 months. The mean concentration of PCAs over the sampling period was 320±320 pgm−3(arithmetic mean±1 S.D.) with a geometric mean of 160pgm−3. Hexa- and hepta-chlorinated dodecane congeners are the predominant PCA components in the UK atmosphere. Analyses of gas phase and particulate phase PCAs indicate that 95% of the PCA content of the atmosphere is in the gas phase. No seasonal trend or dependence on temperature was observed. The data can be divided into 2 significantly different (P<0.01) populations: one group of incidences of lower concentrations of 150±110pgm−3and one of higher concentrations of 800±170pgm−3. The incidences of elevated concentrations could not be related to increased air temperature or other meteorological factors on the time-scale employed and suggest that atmospheric PCA concentrations in the UK may be dominated by episodic incidences of advective transport of contaminated air masses and/or releases to the environment from regional primary point sources rather than by temperature-dependent transport processes. Levels of PCAs in the UK atmosphere are similar to values obtained at a semi-rural location in Canada and at least an order of magnitude higher than in the Canadian Arctic atmosphere. These data represent the first detailed study on the occurrence of PCAs in the atmosphere and show that PCAs can be a major component of the persistent organic pollutant burden of the atmosphere which has the potential of undergoing long-range atmospheric transport processes.