Metal(loid) soil contamination is a widespread issue and its remediation a priority. Phytoremediation involves the use of plants to stabilize/extract metal(loid)s and prevent spreading of contaminants. Salicaceae are fast growing trees that can tolerate and accumulate metal(loid)s. Amendments may be needed to facilitate plant growth on the contaminated substrate. Biochar, the solid product of pyrolysis, can ameliorate soil properties and reduce metal(loid) bioavailability but showed low affinity toward arsenic. Redmud, a waste product, can immobilize arsenic and other metal(loid)s and improve soil conditions. To evaluate the potential of those amendments to immobilize metal(loid)s and facilitate the establishment of a cover vegetation with willow (Salix dasyclados Wimm.), a pot experiment was conducted using several carbon‐based materials (biochar and activated carbon) and redmuds. Two carbon‐based materials and two redmuds were selected for the pot experiment based on characteristics and sorption tests. A former mining soil was amended with these products and Salix dasyclados cuttings were planted. Biochar and one redmud improved growth of Salix dasyclados Wimm. Redmud, which is cheaper than biochar, performed equally well as the biochar at a lower application rate. It can therefore be concluded that the application of redmud, associated to Salix dasyclados, could be an option for the phytoremediation of an As and Pb contaminated soil. However, these results need to be evaluated on a bigger scale to assess the gain brought by the combination of redmud and Salix dasyclados on the contaminated area.

中文翻译：

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碳基材料和赤泥对金柳 (Salix dasyclados Wimm) 金属（液体）固定和生长的影响。在被砷和铅污染的前矿山技术溶胶上

金属（液体）土壤污染是一个普遍存在的问题，其修复是当务之急。植物修复涉及使用植物来稳定/提取金属（类物质）并防止污染物扩散。杨柳科是快速生长的树木，可以耐受和积累金属（类物质）。可能需要修改以促进受污染基质上的植物生长。生物炭是热解的固体产物，可以改善土壤性质并降低金属（类）生物有效性，但对砷的亲和力较低。Redmud 是一种废物，可以固定砷和其他金属（类）物质并改善土壤条件。评估这些修正在固定金属（类）物质和促进用柳树（Salix dasyclados Wimm.）建立覆盖植被的潜力，使用几种碳基材料（生物炭和活性炭）和红泥进行了盆栽实验。根据特性和吸附试验，选择了两种碳基材料和两种赤泥进行盆栽实验。用这些产品改良了以前的采矿土壤，并种植了柳枝扦插。Biochar 和一种红泥改善了 Salix dasyclados Wimm 的生长。Redmud 比 biochar 便宜，但在较低的施用率下表现与 biochar 相同。因此可以得出结论，与 Salix dasyclados 相关的 redmud 的应用可能是植物修复 As 和 Pb 污染土壤的一种选择。然而，这些结果需要在更大的范围内进行评估，以评估红泥和沙柳组合对污染区域带来的收益。