Spatial and temporal variation of polychlorinated biphenyl (PCB) in precipitation in southern Sweden
Spatial and temporal variation of polychlorinated biphenyl (PCB) in precipitation in southern Sweden
复制标题
DOI：
10.1016/s0048-9697(01)00901-9
复制
发表时间：
2002-02-21
影响因子：
9.8
通讯作者：
Agrell, C
中科院分区：
文献类型：
--
作者：
Backe, C;Larsson, P;Agrell, C
研究了11个采样点1年降水中多氯联苯（PCB）浓度的时空变化，并与空气中多氯联苯浓度进行了比较。这项研究是在瑞典南部一个面积约1000公里(2)的地区进行的。降水中PCB浓度在1.18 ~ 81.4 ng l（-1）之间。其中两个采样点的浓度比其他采样点高出约30倍。地点之间的浓度差异可以用地点、天气条件和空气中颗粒含量的差异来解释。风向对沿海地区降水中多氯联苯浓度有重要影响，而在内陆地区，风向对多氯联苯浓度影响不大。我们没有发现降水中多氯联苯浓度的季节性趋势或任何依赖于气温。为了检验降水清除的强度，计算了总冲刷比（W-t）。W-t随时间变化很大，在空气中多氯联苯浓度高的两个地点观察到最高的比率。此外，主成分分析表明，降水中高浓度的多氯联苯与高氯化模式相关。在大多数地点，多氯联苯浓度与降雨量呈显著负相关。(C) 2002 Elsevier Science B.V.版权所有
Spatial and temporal variations in polychlorinated biphenyl (PCB) concentrations were studied in precipitation at 11 sampling-sites over a period of I year and compared with PCB concentrations in the air. The study was carried out in a region of southern Sweden approximately I 1000 km(2) in area. The PCB concentration in precipitation ranged between 1.18 and 81.4 ng l(-1). Two of the sampling sites showed concentrations that were approximately 30 times higher than at the rest of the sites. The variation in concentration between sites may be explained by location as well as by differences in weather conditions and particle content in the air. Wind direction played an important role for PCB concentration in precipitation in coastal areas, while at the inland sites this variable seemed to have a minor influence. We found no seasonal trends in PCB concentration in precipitation or any dependence on air temperature. To examine the intensity of precipitation scavenging, the total washout ratios (W-t) were calculated. There was a large variation in W-t over time, and the highest ratios were observed at the two sites where PCB concentration in the air was high. Furthermore, high concentrations of PCB in precipitation correlated with a high-chlorinated pattern, as shown by principal component analysis. For most of the sites there was a significantly negative relationship between PCB concentration and rain volume. (C) 2002 Elsevier Science B.V. All rights reserved.