Geebelen Wouter, Sappin-Didier Valérie, Ruttens Ann, Carleer Robert, Yperman Jan, Bongué-Boma Kwèlè, Mench Michel, van der Lelie Niels, Vangronsveld Jaco
Hasselt University, Centre for Environmental Sciences, Environmental Biology, Agoralaan--Gebouw D, B-3590 Diepenbeek, Belgium.
Environ Pollut. 2006 Nov;144(1):32-9. doi: 10.1016/j.envpol.2006.01.013. Epub 2006 Feb 28.
In order to reduce the health risks associated with historically enriched metal smelting sites in Flanders (Belgium), the capacities of a non-beringite cyclonic ash and commercial Na-silicates to fix metals and create conditions to restore vegetation cover were evaluated and compared to lime and H(3)PO(4). All tested amendments reduced Ca(NO(3))(2)-extractable soil metal concentrations and reduced metal uptake in Agrostis capillaris seedlings. Sodium released by Na-silicates was possibly toxic to bean plants while an isotopic dilution technique revealed that metals were only weakly sorbed by silicates (i.e. reversible sorption). Cyclonic ash appeared more efficient than lime in both reducing oxidative stress in beans and Zn, Cu and Pb uptake in grasses. The metal fixing mechanism for both amendments appeared similar (i.e. irreversible fixation at constant pH), in contrast to H(3)PO(4) where at least part of the immobilised Cd was irreversibly fixed across a range of pH.
为降低比利时弗拉芒地区历史悠久的金属冶炼场地带来的健康风险，对一种非水化石榴石旋风灰和商用硅酸钠固定金属以及创造植被恢复条件的能力进行了评估，并与石灰和磷酸进行比较。所有测试的改良剂均降低了Ca(NO₃)₂可提取的土壤金属浓度，并减少了毛细翦股颖幼苗对金属的吸收。硅酸钠释放的钠可能对豆类植物有毒，而同位素稀释技术表明，金属仅被硅酸盐微弱吸附（即可逆吸附）。在降低豆类氧化应激以及减少草类对锌、铜和铅的吸收方面，旋风灰似乎比石灰更有效。两种改良剂的金属固定机制似乎相似（即在恒定pH值下不可逆固定），而磷酸则不同，其中至少部分固定的镉在一系列pH值范围内都是不可逆固定的。
