Université de Toulon , PROTEE, EA 3819, 83957 La Garde, France.
Water Quality Center, Trent University , 1600 West Bank Drive, Peterborough, Ontario, Canada K9J 7B8.
Environ Sci Technol. 2015 Oct 6;49(19):11438-48. doi: 10.1021/acs.est.5b01893. Epub 2015 Sep 17.
Heavily contaminated sediments are a serious concern for ecosystem quality, especially in coastal areas, where vulnerability is high due to intense anthropogenic pressure. Surface sediments (54 stations), 50 cm interface cores (five specific stations), river particles, coal and bulk Pb plate from past French Navy activities, seawater and mussels were collected in Toulon Bay (NW Mediterranean Sea). Lead content and Pb stable isotope composition have evidenced the direct impact of sediment pollution stock on both the water column quality and the living organisms, through the specific Pb isotopic signature in these considered compartments. The history of pollution events including past and present contaminant dispersion in Toulon Bay were also demonstrated by historical records of Pb content and Pb isotope ratios in sediment profiles. The sediment resuspension events, as simulated by batch experiments, could be a major factor contributing to the high Pb mobility in the considered ecosystem. A survey of Pb concentrations in surface seawater at 40 stations has revealed poor seawater quality, affecting both the dissolved fraction and suspended particles and points to marina/harbors as additional diffuse sources of dissolved Pb.
受污染严重的沉积物是生态系统质量的一个严重关注点，特别是在沿海地区，由于人类活动的强烈压力，其脆弱性很高。在土伦湾（西北地中海）采集了表层沉积物（54 个站位）、50cm 界面岩芯（五个特定站位）、河流颗粒、过去法国海军活动的煤和块状 Pb 板、海水和贻贝类生物。通过这些考虑因素中特定的 Pb 同位素特征，证明了沉积物污染存量对水团质量和生物的直接影响。历史记录还表明了过去和现在污染物在土伦湾的扩散情况，这些记录包括沉积物剖面中 Pb 含量和 Pb 同位素比值的历史。通过批量实验模拟的沉积物再悬浮事件可能是导致所考虑生态系统中 Pb 高迁移性的一个主要因素。对 40 个站位的表层海水中 Pb 浓度的调查表明，海水水质较差，影响溶解部分和悬浮颗粒，并表明码头/港口是溶解 Pb 的额外弥散源。
