Tapia Yasna, Salazar Osvaldo, Seguel Oscar, Suazo-Hernández Jonathan, Urdiales-Flores Diego, Aponte Humberto, Urdiales Cristian
Departamento de Ingeniería y Suelos, Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago 11315, Chile.
Center of Plant, Soil Interaction and Natural Resources Biotechnology, Scientific and Biotechnological Bioresource Nucleus (BIOREN-UFRO), Universidad de La Frontera, Avenida Francisco Salazar, Temuco 01145, Chile.
Toxics. 2024 Nov 27;12(12):860. doi: 10.3390/toxics12120860.
Copper mining drives economic growth, with the global demand expected to reach 120 million metric tons annually by 2050. However, mining produces tailings containing heavy metals (HMs), which poses environmental risks. This study investigated the efficacy of phytoremediation (Phy) combined with electrokinetic treatment (EKT) to increase metal uptake in grown in tailings from the Metropolitan Region of Chile. The plants were exposed to varying voltages and treatment durations. In the control (no EKT), the root metal contents were Fe (1008.41 mg/kg) > Cu (176.38 mg/kg) > Mn (103.73 mg/kg) > Zn (30.26 mg/kg), whereas in the shoots, the order was Mn (48.69 mg/kg) > Cu (21.14 mg/kg) > Zn (17.67 mg/kg) > Fe (27.32 mg/kg). The optimal EKT (15 V for 8 h) significantly increased metal uptake, with roots accumulating Fe (5997.24 mg kg) > Mn (672 mg kg) > Cu (547.68 mg kg) > Zn (90.99 mg kg), whereas shoots contained Fe (1717.95 mg kg) > Mn (930 mg kg) > Cu (219.47 mg kg) > Zn (58.48 mg kg). Although EKT enhanced plant growth and biomass, higher voltages stressed the plants. Longer treatments were more effective, suggesting that EK-Phy is a promising method for remediating metal-contaminated tailings.
铜矿开采推动经济增长，预计到2050年全球年需求量将达到1.2亿吨。然而，采矿产生的尾矿含有重金属，这带来了环境风险。本研究调查了植物修复（Phy）与电动处理（EKT）相结合，以增加在智利大都会地区尾矿中生长的植物对金属的吸收效果。将植物暴露于不同电压和处理持续时间下。在对照（无EKT）中，根部金属含量为Fe（1008.41毫克/千克）> Cu（176.38毫克/千克）> Mn（103.73毫克/千克）> Zn（30.26毫克/千克），而在地上部分，顺序为Mn（48.69毫克/千克）> Cu（21.14毫克/千克）> Zn（17.67毫克/千克）> Fe（27.32毫克/千克）。最佳EKT（15伏，持续8小时）显著增加了金属吸收，根部积累的Fe（5997.24毫克/千克）> Mn（672毫克/千克）> Cu（547.68毫克/千克）> Zn（90.99毫克/千克），而地上部分含有Fe（1717.95毫克/千克）> Mn（930毫克/千克）> Cu（219.47毫克/千克）> Zn（58.48毫克/千克）。虽然EKT促进了植物生长和生物量，但较高电压会使植物受到胁迫。较长的处理更有效，这表明电动植物修复是一种修复金属污染尾矿的有前途的方法。
