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首页> 外文期刊>Environmental Science & Technology >Levels And Vertical Distributions Of Pcbs, Pbdes, And Ocps In The Atmospheric Boundary Layer: Observation From The Beijing 325-m Meteorological Tower
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Levels And Vertical Distributions Of Pcbs, Pbdes, And Ocps In The Atmospheric Boundary Layer: Observation From The Beijing 325-m Meteorological Tower

机译：大气边界层中Pbb，Pbdes和Ocps的水平和垂直分布：从北京325米气象塔的观测

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Polyurethane foam disk passive air sampling was carried out to investigate the levels, vertical distributions, and potential sources of polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) and organochlorine pesticides (OCPs) in the atmospheric boundary layer of an urban site in Asia. Sampling was performed at nine heights (15, 47, 80,120,160, 200, 240, 280,320 m) of the 325-m meteorological tower in Beijing, China over three 2-month periods between December 2006 and August 2007. This is the first study to report vertical variations of PBDEs in the ABL and one of only a few studies to investigate vertical distributions of persistent organic pollutants. The levels of ∑_(19)PCBs and ∑_8PBDEs were relatively low, ranging from 22 to 65 and from 2.3 to 18 pg m~(-3), respectively. Air concentrations of γ-HCH were high, with values in the range of 39-103 pg m~(-3) in winter, 100-180 pg m~(-3) in spring, and 115-242 pg m~(-3) in summer, respectively. a-HCH concentrations ranged from 20 to 86 pg m~(-3), p,p'-DDT between 7.3 and 78 pg m~(-3), and HCB between 15 and 160 pg m~(-3). The seasonal variations of PCBs, PBDEs, and OCPs may reflect different sources for these chemicals, such as those related with regional use (y-HCH), volatilization/re-emission (PBDEs, PCBs, a-HCH), and pesticide impurities (HCB). Although the performance reference compounds (PRCs) were spiked before deployment,the sampling rates showed strong dependency on wind speeds, resulting in large variations in uptake rates in the ABL, ranging from ~7.0 m~(-3) day~(-1) at ground level to 11 m~(-3) day~(-1) at 320 m. Levels of PCBs, PBDEs, and OCPs decreased with increasing ABL height, indicating the potential of Beijing as the local sources.
机译：进行了聚氨酯泡沫盘被动空气采样，以调查亚洲城市站点大气边界层中多氯联苯（PCB），多溴联苯醚（PBDE）和有机氯农药（OCP）的水平，垂直分布和潜在来源。在2006年12月至2007年8月的三个月中，对中国325米气象塔的九个高度（15、47、80、120、160、200、240、280,320 m）进行了采样。这是第一个研究报告了ABL中PBDEs的垂直变化，这是研究持久性有机污染物的垂直分布的少数几项研究之一。 ∑_（19）PCBs和∑_8PBDEs的含量相对较低，分别为22至65和2.3至18 pg m〜（-3）。 γ-六氯环己烷的空气浓度很高，冬天的范围在39-103 pg m〜（-3），春天的范围在100-180 pg m〜（-3），而115-242 pg m〜（-3） 3）分别在夏天。六氯环己烷的浓度范围为20至86 pg m〜（-3），p，p'-DDT在7.3至78 pg m〜（-3）之间，六氯代苯在15至160 pg m〜（-3）之间。多氯联苯，多溴二苯醚和OCP的季节性变化可能反映了这些化学品的不同来源，例如与区域使用（y-HCH），挥发/再排放（PBDEs，多氯联苯，a-HCH）和农药杂质有关的来源（ HCB）。尽管性能参考化合物（PRC）在部署前已加标，但采样率显示出对风速的强烈依赖性，导致ABL的吸收率变化很大，范围为〜7.0 m〜（-3）天〜（-1）地面至320 m处11 m〜（-3）天〜（-1）随着ABL高度的增加，PCB，PBDEs和OCP的水平下降，表明北京有潜力成为当地来源。

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