pH 和硫酸盐度对含水铁酸转化行为的影响和As (v) 调动
Xuedi Wang1, Rui Su1, Miao Xu1
1College of Civil Engineering and Architecture, Liaoning University of Technology Jinzhou 121001 China surui@lnut.edu.cn.
RSC advances
|October 13, 2025
概括
硫酸盐 (SO42-) 度影响水性铁酸盐 (HFA) 转化为酸盐,而pH值是主要因素. 硫酸盐在酸性和中性条件下不同地影响 (As(v)) 的流动性.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 矿物学是什么?矿物学是什么?
背景情况:
- 水性铁酸盐 (HFA) 是矿业影响环境中常见的一种含阶段.
- 了解 (As) 的移动性和相变化对于补救策略至关重要.
- 硫酸盐 (SO42-) 在矿山废水中普遍存在,可以影响的行为.
研究的目的:
- 为了研究硫酸盐度对HFA相变的作用.
- 在不同的条件下确定As{v},Fe{iii}和SO{4}的分区行为.
- 阐明硫酸盐在固定和移动中的作用.
主要方法:
- 实验使用不同的SO4度 (0,50,100毫米) 进行.
- 在环境 (25°C) 和高温 (80°C) 条件下研究了HFA相变和元素分离.
- 在酸性 (4) 和环中性 (6,8) 水平下控制pH值.
主要成果:
- pH 是 HFA 转化为斯科罗迪特的主要驱动因素;SO2-扮演了 pH 相关的次要角色.
- 在pH值为4时,SO2-增加了As (v) 和Fe (iii) 的释放. 在pH值为6和8时,SO2-促进了基本铁酸盐硫酸盐的形成,使Asv不移动.
- SO4的融入到固态阶段随着度和温度的增加而增加,通过结构性融入和离子竞争影响As (v) 的移动性.
结论:
- 硫酸盐通过结构内置和离子竞争调节As(v) 流动性,在酸性和环中性pH下具有不同的行为.
- 这些发现为硫酸盐丰富,采矿影响地区的风险评估和修复系统的设计提供了指导.
- 这项研究强调了pH,硫酸盐和物种化在环境系统中的复杂相互作用.
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