TY - JOUR
T1 - Oxidative Potential of Metal-Containing Nanoparticles in Coal Fly Ash Generated from Coal-Fired Power Plants in China
AU - Xu, Miao
AU - Niu, Zuoshun
AU - Liu, Chang
AU - Yan, Jia
AU - Peng, Bo
AU - Yang, Yi
N1 - Publisher Copyright:
© 2023 The Authors. Co-published by Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, and American Chemical Society.
PY - 2023/9/15
Y1 - 2023/9/15
N2 - The overwhelming magnitude of coal-fired power plants has caused an inevitable release of metal-containing nanoparticles (MNPs) into the atmosphere, which may be inhaled into the respiratory system and cause oxidative stress. In this study, MNPs and oxidative potential (OP) were analyzed in <1 μm fractions of 56 coal fly ashes collected from Chinese CFPPs. The particle number concentrations (PNCs) of Fe- and Ti-containing NPs, as the dominant MNPs in CFAs, were in the range of 1.5 × 109 to 9.4 × 1010 and 6.4 × 108 to 4.1 × 1010 particles/mg, with average particle sizes of 87 and 89 nm, respectively. Average OP values of <1 μm fractions were 1.4-2.2 nmol AA min-1 μg-1 for three simulated lung fluids, which were 2-3 orders of magnitude higher than those of urban atmospheric PM2.5. According to structural equation model analysis, metal concentrations in <1 μm fractions, PNCs of Fe-/Ti-containing NPs, and their corresponding dissolved Fe/Ti (including NPs with minute sizes) can regulate OP of <1 μm fractions in CFAs. Elevated PNCs of MNPs in CFAs can be produced by CFPPs burning low-rank coals and with a low combustion efficiency boiler (e.g., circulating fluidized-bed boiler). Once entering lung fluids, they likely release more dissolved metals or tiny corresponding NPs, thus generating greater OP. This study provides the first comprehensive investigation of OP generated by MNPs in CFAs.
AB - The overwhelming magnitude of coal-fired power plants has caused an inevitable release of metal-containing nanoparticles (MNPs) into the atmosphere, which may be inhaled into the respiratory system and cause oxidative stress. In this study, MNPs and oxidative potential (OP) were analyzed in <1 μm fractions of 56 coal fly ashes collected from Chinese CFPPs. The particle number concentrations (PNCs) of Fe- and Ti-containing NPs, as the dominant MNPs in CFAs, were in the range of 1.5 × 109 to 9.4 × 1010 and 6.4 × 108 to 4.1 × 1010 particles/mg, with average particle sizes of 87 and 89 nm, respectively. Average OP values of <1 μm fractions were 1.4-2.2 nmol AA min-1 μg-1 for three simulated lung fluids, which were 2-3 orders of magnitude higher than those of urban atmospheric PM2.5. According to structural equation model analysis, metal concentrations in <1 μm fractions, PNCs of Fe-/Ti-containing NPs, and their corresponding dissolved Fe/Ti (including NPs with minute sizes) can regulate OP of <1 μm fractions in CFAs. Elevated PNCs of MNPs in CFAs can be produced by CFPPs burning low-rank coals and with a low combustion efficiency boiler (e.g., circulating fluidized-bed boiler). Once entering lung fluids, they likely release more dissolved metals or tiny corresponding NPs, thus generating greater OP. This study provides the first comprehensive investigation of OP generated by MNPs in CFAs.
KW - SP-ICP-MS
KW - coal fly ash
KW - metal-containing NPs
KW - oxidative potential
KW - simulated lung fluids
UR - https://www.scopus.com/pages/publications/85175943524
U2 - 10.1021/envhealth.3c00040
DO - 10.1021/envhealth.3c00040
M3 - 文章
AN - SCOPUS:85175943524
SN - 2833-8278
VL - 1
SP - 180
EP - 190
JO - Environment and Health
JF - Environment and Health
IS - 3
ER -