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控制典型沿海湿地的沉积物中的含量的生物地质化学过程,由干湿交替驱动

Cheng-Cheng Jiang¹, Guang-Hui Yu¹, Xiao-Jie Zhou²

¹Institute of Surface-Earth System Science, School of Earth System Science Tianjin University, Tianjin 300072, China.

Journal of hazardous materials

|September 29, 2024

概括

沿海湿地的干湿循环改变了沉积物的化学成分,影响了的流动性. 这些循环影响铁含量和微生物群落,影响的行为及其潜在风险.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

沿海湿地是重要的生态系统,水位波动显著影响污染物循环.
沉积物中的 (Cd) 行为和生物可用性对环境变化,特别是干湿循环敏感.
关于这些周期如何影响湿地沉积物中的Cd结合机制和流动性的数据有限.

研究的目的:

研究干湿周期对沿海湿地沉积物中的移动性和物种形成的影响.
阐明物理化学参数,纳米酶活性和微生物群落在调节Cd行为中的作用.
了解影响Cd可用性的氧化铁和有机功能群的转化.

主要方法:

化实验模拟干湿周期 (40天无氧,20天有氧).
化学提取技术用于评估Cd的移动性和物种化.
高分辨率质谱仪用于分析有机功能组和氧化铁.
微生物学分析以描述细菌群体的组成.

主要成果:

干湿循环导致沉积物的物理化学性质发生显著变化 (pH,EC,活性铁 (Fe_d)).
的流动性与纳米酶活性 (R²=0.63) 和反应性铁 (Fe_d) (R²=0.51) 强烈相关.
铁氧化物,有机功能组 (碳酸-OH,异形C-H) 和细菌群落 (Bacilli,Clostridia) 的变化与Cd可用性的改变有关.

结论:

沿海湿地的干湿循环动态地改变了沉积物的地化学,影响了的流动性.
反应性铁和纳米酶活性是水位波动下可用性的关键调节者.
细菌群体在调节的可访问性方面发挥着重要作用,突出显示了微生物过程对污染物的命运的重要性.

关键词:

是的组成部分.沿海湿地沿海湿地干湿的交替变化干湿的交替沉积物沉积物是一种沉积物.同步子辐射的辐射.

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