Dalla Valle Matteo, Marcomini Antonio, Sweetman Andrew J, Jones Kevin C
Department of Environmental Science, Institute of Environmental and Natural Sciences, Lancaster University, Lancaster LA1 4YQ, UK.
Environ Int. 2005 Sep;31(7):1040-6. doi: 10.1016/j.envint.2005.05.014.
Two salt marsh cores were collected from the Venice Lagoon, Italy, and analysed for PCDD/Fs. The samples were undisturbed and had an approximately constant accumulation rate. Radiochemical chronologies were established for the different core sections. The PCDD/F pattern in the surficial layers was very similar to that of atmospheric deposition measured in the same area. However, the pattern changed with increasing depth and was very different in the deeper sections, where the highest PCDD/F concentrations were measured. This layer was dated around the 1950s. Deeper layers have a profile similar to the surficial one. Undisturbed salt marsh cores appear to be a reliable tool for the reconstruction of temporal trends in the atmospheric deposition of persistent organic pollutants. It is proposed that the trends in the core reflect atmospheric deposition that probably results from the sum of two different contributions: emissions of the industrial district of Porto Marghera on the edge of the lagoon and the regional background.
从意大利威尼斯潟湖采集了两个盐沼岩芯，并对其进行了多氯二苯并对二噁英/多氯二苯并呋喃（PCDD/Fs）分析。样本未受扰动，且积累速率大致恒定。为不同的岩芯段建立了放射化学年代序列。表层的PCDD/F模式与在同一区域测量的大气沉降模式非常相似。然而，该模式随深度增加而变化，在测量到最高PCDD/F浓度的较深岩芯段差异很大。这一层可追溯到20世纪50年代左右。更深的层具有与表层相似的分布特征。未受扰动的盐沼岩芯似乎是重建持久性有机污染物大气沉降时间趋势的可靠工具。有人提出，岩芯中的趋势反映了大气沉降，这可能是由两种不同贡献的总和导致的：位于潟湖边缘的马尔盖拉港工业区的排放以及区域背景。
