Durand C, Ruban V, Amblès A
Laboratoire Central des Ponts et Chaussées, BP 4129, 44341 Bouguenais Cedex, France.
Environ Technol. 2004 Aug;25(8):881-8. doi: 10.1080/09593330.2004.9619381.
This paper presents the results of a study on trace metal mobility in the sediments of several road and urban infiltration/decantation ponds in France; the trace metal concentrations are indeed high. The potential mobility of trace metals (cadmium, nickel, chromium, copper, lead and zinc) was evaluated by application of the sequential extraction BCR protocol. Results have been compared with those from the IHSS protocol, which allows for the extraction of various forms of organic matter. Cadmium is the most easily exchangeable element in the case of variations in physical-chemical conditions (50% to 60% of Cd is exchangeable and 70% to 80% of Cd remains within the fulvic acid fraction) and is thus easily releasable within an acidic medium. Zinc is also potentially mobile and stays mainly concentrated in fulvic acids, except in the case of the Ronchin sediment (more than 50% in humin). In contrast, nickel and chromium are primarily present in the residual fraction and do not exhibit high mobility. Copper and lead are concentrated in both the humic acid fraction (IHSS protocol) and the organic phase (BCR scheme); consequently, their mobility is limited.
本文介绍了一项关于法国几个道路及城市渗滤/倾析池沉积物中痕量金属迁移性的研究结果；这些沉积物中的痕量金属浓度确实很高。通过应用BCR顺序萃取法评估了痕量金属（镉、镍、铬、铜、铅和锌）的潜在迁移性。已将结果与国际腐殖酸协会（IHSS）法的结果进行了比较，IHSS法可用于萃取各种形态的有机物。在物理化学条件变化的情况下，镉是最易交换的元素（50%至60%的镉可交换，70%至80%的镉保留在富里酸部分），因此在酸性介质中很容易释放出来。锌也具有潜在的迁移性，并且主要集中在富里酸中，除了龙尚（Ronchin）沉积物的情况（超过50%在腐殖质中）。相比之下，镍和铬主要存在于残渣部分，不表现出高迁移性。铜和铅集中在腐殖酸部分（IHSS法）和有机相（BCR方案）中；因此，它们的迁移性有限。
