通过由竹子生物炭介导的Fe-有机配体复合,降低了在土中的可用性
Li Tang1, Ling Xiong2, Haiyan Zhang1
1Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China.
Chemosphere
|November 28, 2023
概括
生物炭修订,特别是竹子生物炭在450°C (BB450),有效地使 (As) 在被洪水淹没的水土壤中不动. 这通过促进铁有机物复合和有益细菌,形成稳定的三元复合体来减少的可用性.
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:
- 在田中的 (As) 污染构成了全球性的挑战,长期的洪水加剧了通过减少性铁矿物溶解释放的As.
- 生物炭修改是一种公认的修复As污染土壤的技术,但它在洪水条件下管理溶解有机物 (DOM) 和铁复合物的作用需要进一步研究.
- 了解生物炭对的可用性,氧化铁和DOM复合的协同作用,对于有效的土壤整治策略至关重要.
研究的目的:
- 为了研究竹子生物炭在不同温度 (300,450和600°C) 烧化后对被洪水淹没的土中的含量的影响.
- 阐明生物炭影响溶解有机物 (DOM) 和氧化铁复合的机制,以及它们对As固定化的后续影响.
- 评估生物炭修改土壤中特定细菌群落的作用及其对被动化的贡献.
主要方法:
- 竹子生物炭在300°C (BB300),450°C (BB450),和600°C (BB600) 的温度下制备.
- 麦土壤的处理包括BB300,BB450,BB600 (1%比,m/m) 的应用,以及在60天的洪水中进行控制 (CK).
- 分析包括评估As的可用性 (A-As),HCl可提取Fe (III) / (II),DOM复合,无形氧化铁的形成,以及细菌群落的丰富性 (Geobacteraceae,Xanthomonadaceae).
主要成果:
- 与对照组 (CK) 相比,BB450修改显著降低了A的可用性.
- BB450促进了铁和DOM的复合,促进了无形氧化铁的形成,增加了电活性细菌 (Geobacteraceae,Xanthomonadaceae) 的丰富性.
- 稳定三元复合物的形成 (As-Fe-DOM) 涉及无形铁氧化物和DOM被确定为As固定的一个关键机制.
结论:
- 竹子生物炭,特别是BB450,通过增强铁有机物复合和促进有益的微生物活动,有效地固定了被洪水淹没的土中的.
- 无形铁氧化物和电活性细菌之间的协同相互作用在长期洪水下释放的的被动化中起着重要作用.
- 这项研究提供了新的洞察力,通过通过生物炭修改在被洪水淹没的田系统中调节铁有机配体复合的As固定化策略.
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