Li Yingming, Zhang Qinghua, Ji Dongsheng, Wang Thanh, Wang Yawei, Wang Pu, Ding Lei, Jiang Guibin
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
Environ Sci Technol. 2009 Feb 15;43(4):1030-5. doi: 10.1021/es802138w.
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 sigma19PCBs and sigma8PBDEs were relatively low, ranging from 22 to 65 and from 2.3 to 18 pg m(-3), respectively. Air concentrations of gamma-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. alpha-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 (gamma-HCH), volatilization/re-emission (PBDEs, PCBs, alpha-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 approximately 7.0 m3 day(-1) at ground level to 11 m3 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.
采用聚氨酯泡沫盘被动空气采样法，对亚洲某城市站点大气边界层中的多氯联苯（PCBs）、多溴二苯醚（PBDEs）和有机氯农药（OCPs）的含量、垂直分布及潜在来源进行了调查。在中国北京325米气象塔的9个高度（15、47、80、120、160、200、240、280、320米）进行采样，采样时间为2006年12月至2007年8月期间的三个2个月时间段。这是首次报道大气边界层中多溴二苯醚垂直变化的研究，也是为数不多的调查持久性有机污染物垂直分布的研究之一。∑19多氯联苯和∑8多溴二苯醚的含量相对较低，分别为22至65皮克/立方米和2.3至18皮克/立方米。γ-六氯环己烷的空气浓度较高，冬季为39 - 103皮克/立方米，春季为100 - 180皮克/立方米，夏季为115 - 242皮克/立方米。α-六氯环己烷浓度为20至86皮克/立方米，p,p'-滴滴涕为7.3至78皮克/立方米，六氯苯为15至160皮克/立方米。多氯联苯、多溴二苯醚和有机氯农药的季节变化可能反映了这些化学物质的不同来源，如与区域使用有关的来源（γ-六氯环己烷）、挥发/再排放（多溴二苯醚、多氯联苯、α-六氯环己烷）以及农药杂质（六氯苯）。尽管在部署前添加了性能参考化合物（PRCs），但采样率显示出对风速的强烈依赖性，导致大气边界层中的吸收速率变化很大，从地面的约7.0立方米/天到320米高度的11立方米/天不等。多氯联苯、多溴二苯醚和有机氯农药的含量随大气边界层高度增加而降低，表明北京存在本地来源的可能性。
