Siderophores are biogenic metallophores that can play significant roles in the dynamics of a range of metals, including Cu, in the soil. Understanding the impact of siderophores on the mobility and the availability of metals in soil is required to optimize the efficiency of soil remediation processes such as phytoextraction. This study compared the ability of siderophores desferrioxamine B (DFOB) and pyoverdine (Pvd) to mobilize metals in a series of Cu-contaminated soils, and investigated the extent their metal mobilization efficiency changed over time and with the level of Cu contamination of the soil. Siderophores were supplied (or not) to Cu-contaminated soils and metal mobility was assessed through their total concentration in 0.005 M CaCl₂ extract. DFOB selectively mobilized Fe and Al while Pvd also mobilized Cu and Ni, Co, V and As but to a lesser degree. The 1:1 relationship between DFOB in the CaCl₂ extract and Fe + Al mobilized from the solid phase suggests that DFOB mobilized metals by ligand-controlled dissolution. The accumulation of Cu in soil enhanced the adsorption of DFOB and Pvd at the surface of soil constituents and the mobilization of Fe to the detriment of Al by the two siderophores. The metal mobilization efficiency of DFOB and to a lesser extent of Pvd decreased over 22 days. According to ¹⁵N-Pvd analyses, Pvd degradation at least partly contributed to the progressive reduction in the metal mobilization efficiency of Pvd. The processes behind these results and the relevance of these results for manipulating the availability of Cu (and Fe) in soil are discussed.

铁载体是生物金属载体，可以在土壤中包括铜在内的一系列金属的动力学中发挥重要作用。需要了解铁载体对土壤中金属的流动性和可用性的影响，以优化植物提取等土壤修复过程的效率。本研究比较了铁载体去铁胺 B (DFOB) 和 pyoverdine (Pvd) 在一系列受铜污染的土壤中迁移金属的能力，并调查了它们的金属迁移效率随时间和土壤铜污染水平的变化程度. 向受铜污染的土壤提供（或不提供）铁载体，并通过它们在 0.005 M CaCl _{2中的总浓度评估金属迁移率}提炼。DFOB 选择性地移动了 Fe 和 Al，而 Pvd 也移动了 Cu 和 Ni、Co、V 和 As，但程度较低。_{CaCl 2}提取物中的 DFOB 与固相迁移的 Fe + Al 之间的 1:1 关系表明 DFOB 通过配体控制的溶解迁移金属。土壤中 Cu 的积累增强了 DFOB 和 Pvd 在土壤成分表面的吸附，以及两种铁载体对 Fe 的迁移，从而损害了 Al。DFOB 和 Pvd 的金属迁移效率在 22 天后下降。根据¹⁵N-Pvd 分析表明，Pvd 降解至少部分导致 Pvd 的金属移动效率逐渐降低。讨论了这些结果背后的过程以及这些结果与控制土壤中铜（和铁）可用性的相关性。