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在沿海沉积物中以水力动力学控制的无生物循环利用有机

Guoqiang Zhao¹, Cai Li¹, Jianyan Wang²

¹State Key Laboratory of Lake and Watershed Science for Water Security, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.

Environmental science & technology

|August 27, 2025

概括

沉积物中的氧化还原波动导致有机 (OP) 的非生物释放. 这一过程依赖于在黑暗中产生的活性氧物种 (ROS),揭示了循环的新途径.

科学领域:

环境化学
地质化学
生物地质化学

背景情况:

有机 (OP) 是沉积物中的重要储物.
主要被认为是生物过程驱动OP脱化.
在氧化还原振荡下OP脱的非生物机制尚不清楚.

研究的目的:

在氧化还原振荡下研究OP中酸盐释放的非生物机制.
确定反应性氧物种 (ROS) 在这种非生物过程中的作用.
了解控制非生物OP矿物化的因素.

主要方法:

实验室模拟水文干扰驱动的氧化还原波动.
对自然河流沉积物的分析.
确定ROS中间体 (超氧化物,过氧化) 和主导基 (基).

主要成果:

导致氧化还原波动的水文扰动介导了OP中的非生物酸盐释放.
在黑暗中产生ROS,特别是基,对于非生物脱是必不可少的.
氧化还原振荡增加了溶解的OP,加速了ROS介导的脱.
沉积物电子交换能力和铁物种化控制反应速率.

结论:

已经确定了一种新的非生物转换途径,该途径是由氧化还原振荡过程中产生的ROS驱动的.
这种非生物途径补充了已知的过程,如酶解水和光降解.
这些发现为沉积物循环和生物可用性提供了新的见解.

关键词:

铁矿物的使用反应性氧物种氧化还原振荡河岸沉积物

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