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Combined μ-XRF and XANES Track the Behavior of Pb from PM Entering Chinese Cabbage Leaves.
Environ Sci Technol
January 2025
State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, 2596 Lekai South Street, Baoding 071000, Hebei, China.
Atmospheric fine particulate matter (PM) is the main contributor to Pb accumulation in edible Chinese cabbage leaves in North China. PM-Pb primarily enters leaves via stomatal foliar uptake. However, how PM-Pb is transported and stored within the leaf cells of Chinese cabbage remains unclear.
View Article and Find Full Text PDFKinetics and Oligomer Products of the Multiphase Reactions of Hydroxyacetone with Atmospheric Amines, Ammonium Sulfate, and Cloud Processing.
ACS Earth Space Chem
December 2024
Université Paris-Est Créteil and Université Paris Cité, CNRS, LISA, Créteil F-94010, France.
Hydroxyacetone (HA) is an atmospheric oxidation product of isoprene and other organic precursors that can form brown carbon (BrC). Measured bulk aqueous-phase reaction rates of HA with ammonium sulfate, methylamine, and glycine suggest that these reactions cannot compete with aqueous-phase hydroxyl radical oxidation. In cloud chamber photooxidation experiments with either gaseous or particulate HA in the presence of the same N-containing species, BrC formation was minor, with similar mass absorption coefficients at 365 nm (<0.
View Article and Find Full Text PDFAerosol light absorption alleviates particulate pollution during wintertime haze events.
Proc Natl Acad Sci U S A
January 2025
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91106.
Aerosol light absorption has been widely considered as a contributing factor to the worsening of particulate pollution in large urban areas, primarily through its role in stabilizing the planetary boundary layer (PBL). Here, we report that absorption-dominated aerosol-radiation interaction can decrease near-surface fine particulate matter concentrations ([PM]) at a large-scale during wintertime haze events. A "warm bubble" effect by the significant heating rate of absorbing aerosols above the PBL top generates a secondary circulation, enhancing the upward motion (downward motion) and the convergence (divergence) in polluted (relatively clean) areas, with a net effect of lowering near-surface [PM].
View Article and Find Full Text PDFSource-dependent absorption Ångström exponent in the Los Angeles Basin: Multi-time resolution factor analyses of ambient PM and aerosol optical absorption.
Sci Total Environ
January 2025
Department of Public Health Sciences, University of Rochester, School of Medicine and Dentistry, Rochester, NY, USA; Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, USA.
Advanced receptor models can leverage the information derived from optical and chemical variables as input by a variety of instruments at different time resolutions to extract the source specific absorption Ångström exponent (AAE) from aerosol absorption. The multilinear engine (ME-2), a Positive Matrix Factorization (PMF) solver, serves as a proficient tool for performing such analyses, thereby overcoming the constraints imposed by the assumptions in current optical source apportionment methods such as the Aethalometer approach since the use of a-priori AAE values introduces additional uncertainty into the results of optical methods. Comprehensive PM chemical speciation datasets, and aerosol absorption coefficients (b, λ) at seven wavelengths measured by an Aethalometer (AE33), were used in multi-time source apportionment (MT-PMF).
View Article and Find Full Text PDFAbsorption photometry of patterned deposits on IMPROVE PTFE filters.
J Air Waste Manag Assoc
December 2024
Air Quality Research Center, University of California, Davis, California, USA.
The IMPROVE program (Interagency Monitoring of PROtected Visual Environments) tracks long-term trends in the composition and optics of regional haze aerosols in the United States. The absorptance of red (633-nm) light is monitored by filter photometry of 24 h-integrated samples of fine particulate matter (PM 2.5).
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