Université de Lyon, Ecole Nationale des Travaux Publics de l'Etat, Laboratoire des Sciences de l'Environnement, Rue Maurice Audin, 69518 Vaulx-en-Velin, France.
Water Sci Technol. 2011;64(1):255-62. doi: 10.2166/wst.2011.161.
Infiltration basins are shallow reservoirs in which stormwater is temporarily collected in order to reduce water volume in downstream networks. The settling of stormwater particles leads to a contaminated sediment layer. Wild plants can colonize these basins and can also play a role on the fate of heavy metals either directly by their uptake or indirectly by modification of physico-chemical characteristics of the sediment and therefore by modification of the mobility of heavy metals. The aim of this study, carried out in a vegetated infiltration basin, is to assess Cd, Cu and Zn mobility in two zones colonized by different species, Phalaris arundinacea and Typha latifolia. The study was carried out using three single chemical extractions: CaCl2 for the exchangeable phase, acetate buffer for the acido-soluble fraction and diethylenetriamine-pentaacetic acid (DTPA) for the fraction associated to the organic matter. Zn and Cd are mainly associated to carbonated and organic matter phases of the sediment. Moreover, acetate buffer-extractable Zn contents are strongly correlated to carbonates content in the sediment. DTPA-extractable Cu contents are strongly correlated with organic carbon sediment contents. We have also noted that extractable contents were significantly different between both zones whatever the metal.
渗透盆地是浅水池，用于暂时收集雨水，以减少下游管网中的水量。雨水颗粒的沉降会导致受污染的泥沙层。野生植物可以在这些盆地中定殖，也可以通过直接吸收或通过改变沉积物的理化特性，从而改变重金属的流动性，从而影响重金属的归宿。本研究在一个植被渗透盆地中进行，旨在评估两种不同物种（芦竹和香蒲）定殖的两个区域中 Cd、Cu 和 Zn 的迁移能力。该研究使用三种单一的化学提取方法进行：CaCl2 用于交换相，乙酸盐缓冲液用于酸溶性部分，二乙三胺五乙酸（DTPA）用于与有机物结合的部分。Zn 和 Cd 主要与沉积物的碳酸盐和有机物相有关。此外，乙酸盐缓冲液可提取 Zn 含量与沉积物中碳酸盐含量呈强相关性。DTPA 可提取 Cu 含量与有机碳沉积物含量呈强相关性。我们还注意到，无论金属如何，两个区域的可提取含量都有显著差异。
