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Reciclaje abiótico controlado hidrodinámicamente de fósforo orgánico en sedimentos ribereños

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

Resumen

Las fluctuaciones de redox en los sedimentos impulsan la liberación de fosfato abiótico del fósforo orgánico (OP). Este proceso se basa en especies reactivas de oxígeno (ROS) generadas en la oscuridad, revelando una nueva vía para el ciclo del fósforo.

Área de la Ciencia:

Química del medio ambiente
Geoquímica
Biogeoquímica

Sus antecedentes:

El fósforo orgánico (PO) es un importante depósito de fósforo en los sedimentos.
Se cree que los procesos biológicos impulsan principalmente la desfosforilación OP.
Los mecanismos abióticos de la desfosforilación de OP bajo oscilaciones redox no se comprenden bien.

Objetivo del estudio:

Investigar el mecanismo abiótico de liberación de fosfato de la OP bajo oscilaciones redox.
Identificar el papel de las especies reactivas de oxígeno (ROS) en este proceso abiótico.
Comprender los factores que controlan la velocidad de la mineralización abiótica de la OP.

Principales métodos:

Simulaciones de laboratorio de las fluctuaciones redox inducidas por perturbaciones hidrológicas.
Análisis de los sedimentos ribereños naturales.
Identificación de los ROS intermedios (superoxido, peróxido de hidrógeno) y el radical dominante (radical hidroxilo).

Principales resultados:

Las perturbaciones hidrológicas que causan fluctuaciones redox median la liberación de fosfato abiótico de OP.
La producción oscura de ROS, particularmente el radical hidroxilo, es esencial para la desfosforilación abiótica.
Las oscilaciones redox aumentan la OP disuelta, acelerando la desfosforilación mediada por ROS.
Capacidad de intercambio de electrones del sedimento y velocidades de reacción de control de la especiación del hierro.

Conclusiones:

Se ha identificado una nueva vía abiótica para la transformación de OP, impulsada por ROS generadas durante las oscilaciones redox.
Esta vía abiótica complementa procesos conocidos como la hidrólisis enzimática y la fotodegradación.
Los hallazgos ofrecen nuevos conocimientos sobre el ciclo del fósforo sedimentario y la biodisponibilidad.

Palabras clave:

Minerales de hierro el fósforo especies reactivas de oxígeno Oscilación redox sedimentos ribereños

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