Assessment of interactions between elemental carbon and metals in black carbon: Hydroxyl radical generation and glutathione depletion.
J Hazard Mater
; 470: 134223, 2024 May 15.
Article
em En
| MEDLINE
| ID: mdl-38593664
ABSTRACT
Elemental carbon (EC) and metals are two important parts of atmospheric black carbon (BC). However, little information is available regarding the interaction between them and its impacts on the reactive oxygen species (ROS) formation and physiological antioxidants depletion. In this study, we chose six most frequently detected metals (Cu(â
¡), Fe(â
¢), Mn(â
¡), Cr(â
¢), Pb(â
¡) and Zn(â
¡)) in BC and examined their interactions with EC in the ROS generation and glutathione (GSH) oxidation. Results showed that only Cu(â
¡) and EC synergically promoted the GSH oxidation and hydroxyl radical (â¢OH) generation. Other five metals had negligible effects on the GSH oxidation regardless of the presence or absence of EC. The synergistic interaction between Cu(â
¡) and EC could be attributed to the superior electrical conductivity of EC. In the process, EC transferred electrons from the adjacent GSH to Cu(â
¡) through its graphitic carbon framework to yield Cu(â
) and GSH radical. Cu(â
) further reacted with dioxygen to generate â¢OH, which eventually led to the oxidation of GSH. Our results revealed a new driving force inducing the ROS formation and GSH depletion as well as provided novel insights into the risk assessment of BC.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Hazard Mater
Assunto da revista:
SAUDE AMBIENTAL
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China
País de publicação:
Holanda