外源六价在土壤中的转化:因素和建模
Ying Li1, Jiaping Lin1, Yang Wu1
1National Observation and Research Station of Coastal Ecological Environments in Macao; Macao Environmental Research Institute, Faculty of Innovation Engineering, Macau University of Science and Technology, Macao SAR 999078, China.
Journal of hazardous materials
|September 18, 2024
概括
需要在土壤中对六价 (Cr(VI)) 的转化进行定量模型. 这项研究开发了一个模型,显示土壤pH和时间控制Cr (VI) 降低和固定,有助于环境风险评估.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 外源六价 (Cr(VI)) 构成环境风险,需要对其土壤转化进行定量模型.
- 目前的模型在预测Cr6的命运和不同土壤环境中的影响因素方面缺乏准确性.
- 了解Cr (VI) 转化对于有效的环境风险评估和污染土壤监管至关重要.
研究的目的:
- 研究中国各种土壤中外源性Cr (VI) 的转化过程.
- 确定影响Cr(VI) 减少和固定的主要因素.
- 开发一种定量模型,用于预测土壤中的Cr (VI) 转化.
主要方法:
- 在13种不同的中国土壤中用100毫克的kg-1 Cr (VI) 施加.
- 在90-120天内监测Cr形式 (Cr(VI) 和Cr(III)) 的变化.
- 开发和验证使用土壤pH值和化时间的两参数模型.
主要成果:
- 发生了Cr (VI) 的减少和固定,降低了Cr (VI) 和Cr (III) 的可用性.
- 土壤pH值是主要的控制因素,pH值为6.5,作为一个关键的拐点.
- 一个经过验证的模型 (R2 = 0.98,RMSE = 7.94%) 准确地预测了由电子扩散驱动的Cr (VI) 到Cr (III) 减少.
结论:
- 土壤pH显著影响Cr的转化,而酸性条件 (<6.5) 促进了转化,减少了Cr的可用性.
- 开发的半机械模型为了解土壤中长期的Cr (VI) 演变提供了一种定量工具.
- 这项研究有助于评估污染了氧化还原敏感金属如的土壤的风险.
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