Atmospheric Deposition of Particulate Matter and Micropollutants as a Major Mass Transport Route to Surface Water in Winter: Measurement and Modeling in Beijing in 2014 and 2021

Abstract

Deposition is a major route for atmospheric pollutants such as heavy metals and polycyclic aromatic hydrocarbons (PAHs) to transport to surface water. Here, we study Beijing, China, during the heavy haze period (2014) and the pandemic period (2021) to investigate the correlation between the atmospheric and surface water concentrations of 12 heavy metals and 16 PAHs. Pearson correlations and a series of back propagation (BP) neural network (NN) models are employed, and local meteorological conditions are included as input variables for the analysis. The surface water concentration of most pollutants analyzed correlate positively with humidity, PM2.5, PM10, NO2, SO2, and CO, while negatively with the wind speed. The correlation coefficients are bigger in 2014 than in 2021, indicating accelerated gas–aqueous mass transport during haze episodes. The accurate prediction of the BP NN model in 2014 and 2021 presents itself as a promising tool in guiding future modeling efforts and policy changes.

Water-Insoluble Sustainable Magnetic Nanoparticles for Green Extraction of Metallic Pollutants from Aqueous Bulk: Host–Guest Interactions at Immiscible Interfaces

“…Diverse uses of nanomaterials leave nanometallic pollutants in water resources with unknown consequences for the aquatic life. , They eventually end up in the food chain supply for human consumption and become major health hazards. , To address this problem, better technologies are required that possess the ability to remove nanometallic pollutants from contaminated water. Such pollutants are difficult to remove by conventional filtration processes because of their nanodimensions.…”