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酸对生物炭改性污染土壤中Cd物种化的影响

Bingyao Xu^1,2,3, Jiayu Xu¹, Meiqi Wang¹

¹Xiaoqinling Ecological Restoration Field Scientific Observation and Research Station of Yellow River Basin at Henan, International Joint Research Laboratory for Global Change Ecology, School of Life Sciences, Henan University, Kaifeng, 475004, China.

Environmental geochemistry and health

|June 21, 2025

概括

生物炭修正案使受污染的土壤中的 (Cd) 不动化,特别是在较低的热解温度下. 然而,添加酸可以调动Cd,尽管高水平的生物炭可能会减轻这种效应.

科学领域:

环境科学环境科学
土壤科学土壤科学
地质化学地质化学

背景情况:

重金属污染对土壤和生态系统构成风险.
生物炭是一个有希望的修正案,用于固定土壤中的重金属.
低分子量有机酸 (LMWOA) 可以影响金属的物种化和流动性.

研究的目的:

研究生物炭性质 (热解温度,应用速率) 对 (Cd) 物种化的影响.
评估酸 (LMWOA) 在生物炭修改土壤中改变Cd化学特异性的作用.
了解生物炭和酸对Cd流动性和生物可用性的联合作用.

主要方法:

土壤化实验采用不同的生物炭应用率 (1-5%) 和热解温度 (300-700°C).
添加酸以评估其对Cd特异化的影响.
顺序提取以确定土壤中Cd的化学分数.

主要成果:

生物炭的应用显著降低了Cd的可交换分数 (F1),表明了固定.
在较低温度下产生的生物炭表现出优异的Cd固定.
添加酸增加了Cd的流动性,通过将固定分数转化为更不稳定的形式.
较高的生物炭应用率通过缓冲pH值变化来减轻酸的调动作用.

结论:

生物炭在受污染的土壤中有效地固定了Cd,较低的热解温度增强了这种效果.
酸可以逆转生物炭的固定效应,增加Cd的移动性.
生物炭率和酸之间的相互作用对于管理污染土壤中的Cd风险至关重要.

关键词:

生物炭是一种生物炭.Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd Cd 在线播放在线播放在线播放在线播放化学物种的分类化学物种的分类酸是一种酸.变化转化转化转化

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