On November 5th, 2015, a mining dam spilled a huge plume of mining waste in the Doce River. Even though many studies have reported the environmental impact from the Doce River's tragedy, the transport of potentially toxic elements (PTE) by kinetic modeling to determine how long the basin takes to achieve the natural balance has not been described. Therefore, samples of sludge, sediment, and water were collected along the Doce River basin, to assess the elements' total leaching by kinetic modeling. The elements Fe, Al, Mn, Cu, Ag, Pb, Cd, and As were evaluated. An innovative mobilization factor (F_S/D) indicated that Mn²⁺, Ag⁺, and Cd²⁺ can be mobilized about 80, 89, and 57 times more than its initial concentration. Besides, in low pH, the Al and Pb ions can be mobilized. The desorption kinetics showed a lower rate constant (k) and higher initial desorption constant (h) for Mn²⁺ than Cd²⁺ and Ag⁺, suggesting both high- and low-affinity interaction sites for Mn²⁺. The exponential decay demonstrated that metals can leach for months or years. Thus, the long-lasting release of metals from mining tailing waste in concentrations that endanger the ecosystem and human health makes clear the need for long-term monitoring.

2015 年 11 月 5 日，一座采矿大坝在 Doce 河中溢出了大量采矿废物。尽管许多研究报告了多西河悲剧对环境的影响，但尚未描述通过动力学模型确定流域达到自然平衡需要多长时间的潜在有毒元素 (PTE) 的迁移。因此，沿 Doce 河流域收集了污泥、沉积物和水的样本，以通过动力学模型评估元素的总浸出量。对元素 Fe、Al、Mn、Cu、Ag、Pb、Cd 和 As 进行了评估。创新的动员因子 (F _{S / D} ) 表明 Mn ²⁺、Ag ⁺和 Cd ²⁺可以比其初始浓度高出约 80、89 和 57 倍。此外，在低 pH 值下，Al 和 Pb 离子可以移动。解吸动力学显示了较低的速率常数（ķ）和较高的初始解吸常数（ħ为Mn）为²⁺比镉²⁺和Ag ⁺，表明锰既高和低亲和力相互作用位点²⁺。指数衰减表明金属可以浸出数月或数年。因此，从采矿尾矿废物中长期释放的金属浓度会危及生态系统和人类健康，这清楚地表明需要进行长期监测。