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Reacciones superficiales de aminas orgánicas durante la limpieza de blanqueadores en interiores: nitrosamina,

Lifang Zhang^1,2, Xiaoqiao Jiao^1,2, Wenting Yuan^1,2

¹State Key Laboratory of Soil Pollution Control and Safety, Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.

Environmental science & technology

|February 11, 2026

Resumen

Los desinfectantes de cloro reaccionan con aminas de interior, formando nitrosaminas peligrosas y persistentes y otros contaminantes. Estas reacciones, que ocurren en las superficies durante la limpieza, crean riesgos de exposición a nuevos compuestos químicos.

Área de la Ciencia:

Química del medio ambiente Química del medio ambiente
Calidad del aire en interiores.
La cinética química es la cinética química.

Sus antecedentes:

Los desinfectantes a base de cloro se utilizan ampliamente en interiores, lo que lleva a la transformación de contaminantes.
La formación de contaminantes secundarios a través de reacciones superficiales heterogéneas es poco conocida.

Objetivo del estudio:

Investigar los mecanismos y productos de los gases reactivos de cloro (GRC) que reaccionan con las aminas superficiales.
Determinar la cinética y los factores de influencia de estas reacciones heterogéneas.
Evaluar la persistencia ambiental y los riesgos de exposición de los productos generados.

Principales métodos:

Experimentos de tubo de flujo que simulan las condiciones de limpieza en interiores.
Reacción de la cloramina (un RCG) con las aminas aromáticas y alifáticas absorbidas en la superficie.
Análisis no dirigido para identificar diversos productos de transformación.
Estudios cinéticos que varían la humedad relativa (RH) y las concentraciones de reactivos.

Principales resultados:

Las RCG reaccionaron con aminas para formar nitrosaminas, hidrazinas, especies cloradas y dímeros.
La reacción de la dibenzilamina mostró una vida media de ~2,1 horas con rendimientos significativos de nitrosamina e hidrazina.
Se observó una amplia diversidad de productos, incluidos los productos de hendidura de anillos, hidroxilación y cloración.
La formación y la cinética del producto dependen de la HR, los niveles de cloramina y la estructura de aminas.
La formación de estos productos se confirmó durante los eventos reales de limpieza de interiores.

Conclusiones:

Las reacciones heterogéneas entre las RCG y las aminas superficiales generan productos de transformación diversos, persistentes y peligrosos.
Estos productos presentan riesgos significativos de exposición en interiores debido a su mayor persistencia ambiental.
Los hallazgos destacan una vía crítica y subestimada para la formación de contaminantes secundarios durante la limpieza del hogar.

Palabras clave:

Limpieza con blanqueador para limpieza.reacción heterogénea de reacción.Química de interiores en el interior.Las aminas orgánicas son aminas orgánicas.gases de cloro reactivos y reactivos.

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