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Identificación de la fuente y exportación costera de sulfato en un río de una megaciudad: Perspectivas de isótopos de

Xuehui Liu¹, Guilin Han¹, Jinke Liu¹

¹State Key Laboratory of Geomicrobiology and Environmental Changes, Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing, 100083, China; Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences (Beijing), Beijing, 100083, China.

Marine pollution bulletin

|February 10, 2026

Resumen

El exceso de sulfato (SO4 ^ 2-) de los ríos de las megaciudades amenaza los ecosistemas marinos. Este estudio rastreó las fuentes de sulfato en el río Yongding, encontrando que las actividades humanas aumentan significativamente la contaminación aguas abajo, impactando el ciclo de azufre del mar de Bohai.

Área de la Ciencia:

Ciencias del medio ambiente Ciencias del medio ambiente.
La geoquímica es la geoquímica.
Biología Marina Biología Marina.

Sus antecedentes:

Los ríos de las megaciudades exportan sulfato sustancial (SO4 ^ 2-) a los mares marginales, alterando la salud del ecosistema marino.
La comprensión de las fuentes de sulfato es crucial para la gestión de los entornos marinos y la prevención de la contaminación.
El río Yongding, un afluente clave del mar de Bohai, se enfrenta a una carga significativa de sulfatos de las actividades urbanas.

Objetivo del estudio:

Para cuantificar las concentraciones de sulfato (SO4^2-) e isótopos de azufre (δ34SSO4) en el río Yongding.
Identificar y determinar las contribuciones de varias fuentes de sulfato, tanto naturales como antropogénicas.
Evaluar el impacto de las actividades humanas en el ciclo del azufre y proponer estrategias de gestión para la gestión integrada de cuencas hidrográficas tierra-mar.

Principales métodos:

Muestreo de campo y análisis químico de muestras de agua para sulfato (SO4^2-) y δ34SSO4.4.
Aplicación de indicadores hidroquímicos y relaciones iónicas para identificar fuentes potenciales de sulfato.
Utilizando un modelo inverso de Monte Carlo que integra datos isotópicos e iónicos para la distribución de fuentes.

Principales resultados:

Las concentraciones de sulfato (SO4^2-) promediaron 147 mg·L-1, con valores de δ34SSO4 que oscilaron entre +5.85‰ y +14.99‰.
La intemperie natural dominó aguas arriba (61%), mientras que las fuentes antropogénicas (aguas residuales: 41%, industria: 33%) se convirtió en dominante aguas abajo (75%).
Se estimó un flujo anual de sulfato (SO4 ^ 2-) de 2,31 × 10-4 Tmol / año para el mar de Bohai, con más del 70% de origen antropogénico.

Conclusiones:

Las actividades antropogénicas, particularmente las aguas residuales y las descargas industriales, son los principales impulsores de la contaminación por sulfatos (SO4 ^ 2-) en el río Yongding y su exportación al mar de Bohai.
Se propone un marco hidrológico-carga-redox (H-L-R) para el control eficaz de la contaminación y la gestión integrada de cuencas hidrográficas.
El modelado inverso proporciona una herramienta robusta para el rastreo de contaminantes y la evaluación de riesgos en sistemas marinos con impacto humano.

Palabras clave:

Influencia antropogénica de las influencias antropogénicas El modelo inverso del modelo.Los mares marginales son las aguas marginales.El flujo de flujo de sulfato.El isótopo de azufre es un isótopo de azufre.Ríos urbanos Los ríos urbanos.

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