Brown Jeffrey N, Peake Barrie M
Chemistry Department, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Sci Total Environ. 2006 Apr 15;359(1-3):145-55. doi: 10.1016/j.scitotenv.2005.05.016. Epub 2005 Jul 12.
Polycyclic aromatic hydrocarbons (PAHs) and heavy metals were measured in road debris collecting in urban areas and in the suspended sediment (SS) component of runoff from two stormwater catchments in Dunedin, New Zealand. Levels in the road debris ranged from 119-527 microg/g for lead, 50-464 microg/g for copper, 241-1 325 microg/g for zinc and 1.20-11.6 microg/g for sigma16PAH. The SS from the largely rural catchment (20% urban) had similar concentrations to the road debris, indicating that this urban material was the main source of the contaminants measured in the stormwater. Similar PAH fingerprint profiles and isomer ratios indicative of dominant pyrogenic (combustion) sources were also found in these two groups of materials. The SS from the 100% urban catchment contained 2- to 6-fold higher concentrations of metals and 10-fold greater levels of sigma16PAH. The higher levels of lead and copper were probably a result of industrial land uses in this catchment, while the additional zinc was linked to an abundance of zinc-galvanised roofing iron in the catchment's residential suburbs. The PAH profiles and isomer ratios were different for this urban catchment and suggested that a disused gasworks was contributing PAHs to the stormwater runoff.
对新西兰达尼丁两个雨水集水区径流中的悬浮沉积物（SS）成分以及城市地区收集的道路垃圾中的多环芳烃（PAHs）和重金属进行了测量。道路垃圾中的铅含量在119 - 527微克/克之间，铜含量在50 - 464微克/克之间，锌含量在241 - 1325微克/克之间，∑16PAH含量在1.20 - 11.6微克/克之间。来自主要为农村地区（20%为城市区域）的集水区的SS与道路垃圾中的污染物浓度相似，这表明城市垃圾是雨水中所测污染物的主要来源。在这两组物质中还发现了相似的PAH指纹图谱和指示主要热解（燃烧）源的异构体比例。来自100%城市集水区的SS中金属浓度高出2至6倍，∑16PAH含量高出10倍。较高的铅和铜含量可能是该集水区工业用地的结果，而额外的锌则与集水区住宅郊区大量的锌镀锌铁皮屋顶有关。该城市集水区的PAH图谱和异构体比例有所不同，这表明一个废弃的煤气厂正在向雨水径流中排放PAHs。
