在洪水和排水过程中,Hg在受污染的性土中的转化和迁移
Shiwen Hu1, Yufan Zhang1, Hanbing Meng1
1National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-Environ. Pollut. Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China.
Environmental pollution (Barking, Essex : 1987)
|February 9, 2024
概括
在田土壤中的污染是令人担忧的. 这项研究表明,大米中的流动性和生物积累率较低,这表明性土壤的环境风险降低.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 在土中的 (Hg) 污染对人类健康和生态系统构成风险.
- 了解Hg的物种化和转化对于评估其环境行为和毒性至关重要.
- 土经历氧化还原变化,影响的流动性和生物可用性.
研究的目的:
- 为了研究转化,甲基化,生物积累以及污染的性田土壤中的相关风险.
- 阐明生物地化学循环在水银环境命运中的作用.
- 评估对大米生产和安全的影响.
主要方法:
- 使用Hg污染的性大米土进行了微观和实验.
- 分析了的特异化,包括有机,硫化物结合和残留形式.
- 在洪水和排水期间监测pH值,氧化还原潜力和关键元素循环的变化.
主要成果:
- 超过98%的总Hg被发现在稳定的有机,硫化物结合和残留分数中,表明其流动性低 (<2%).
- 反氧变化影响了Hg的流动性:减少促进了流动性,而氧化增加了稳定性.
- 在水组织 (根 > 叶 > 茎 > 谷物) 中积累的,谷物度低于每日摄入量限制.
结论:
- 性土中的具有较低的流动性和环境风险,这是由于稳定的物种化.
- 反氧循环显著影响的生物可用性和无机Hg (IHg) 和甲基 (MeHg) 之间的转化.
- 在这些土壤中种植大米相对安全,谷物中的Hg积累不超过安全值.
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