The functional and C isotopic compositions of water-soluble organic carbon (WSOC) in atmospheric aerosol were determined by nuclear magnetic resonance (H-NMR) and isotope ratio mass spectrometry (IRMS) in an urban location in the Southern Mississippi Valley. The origin of WSOC was resolved using the functional distribution of organic hydrogen, δC ratio, and positive matrix factorization (PMF). Three factors were retained based on NMR spectral bins loadings. Two factors (factors 1 and 3) demonstrated strong associations with the aliphatic region in the NMR spectra and levoglucosan resonances. Differences between the two factors included the abundance of the aromatic functional group for factor 1, indicating fresh emissions and, for factor 3, the presence of resonances attributed to secondary ammonium nitrate and low δC ratio values that are indicative of secondary organic aerosol. Factors 1 and 3 added 0.89 and 1.08 μgC m, respectively, with the highest contribution in the summer and fall. Factor 2 retained resonances consistent with saccharides and was attributed to pollen particles. Its contribution to WSOC varied from 0.22 μgC m in winter to 1.04 μgC m in spring.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4905722 | PMC |
| http://dx.doi.org/10.1016/j.atmosenv.2015.12.067 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Design and synthesis of cyclic lipidated peptides derived from the C-terminus of Cx43 for hemichannel inhibition and cardiac endothelium targeting.
RSC Med Chem
December 2024
Research Group of Organic Chemistry, Departments of Bioengineering Sciences and Chemistry, Vrije Universiteit Brussel Brussels Belgium
A peptide segment that is 10 residues long at the C-terminal (CT) region of Cx43 is known to be involved in interactions, both with the Cx43 protein itself and with other proteins, that result in hemichannel (HC) activity regulation. Previously reported mimetic peptides based on this region (, , ) have been revealed to be promising therapeutic agents in the context of cardiovascular diseases. In this work, novel approaches, such as C- and N-terminal modification and cyclization, to improve the proteolytic stability and bioavailability of the peptide are presented.
View Article and Find Full Text PDFWaterborne Recoatable Transparent Superhydrophobic Coatings with Excellent Self-Cleaning and Anti-Dust Performance.
Small
January 2025
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China.
Superhydrophobic surfaces have attracted tremendous attention due to their intriguing lotus-leaf-like water-repelling phenomenon and wide applications, however, most superhydrophobic coatings are prepared with environmentally unfriendly organic solvents and suffer from poor mechanical strength. To solve these issues, waterborne recoatable superhydrophobic (WRSH) coatings are developed based on a novel self-synthesized water-soluble fluorinated acrylic polymer and hydrophobic modified silica nanoparticles. The trade-off between waterborne and superhydrophobicity is well mediated by protonation and deprotonation of the fluorinated acrylic polymer.
View Article and Find Full Text PDFUsing the TOPSIS method to select the best low-toxicity organic cosolvent for rice-based toxicity tests.
Ecotoxicol Environ Saf
January 2025
College of Environmental Science & Engineering, Guilin University of Technology, Guilin 541004, PR China. Electronic address:
The application of low-toxicity cosolvents in phytotoxicity tests is a common technique to enhance the distribution of non-water-soluble organic pollutants in the aqueous phase. In this study, the physiological and biochemical responses of rice seedlings to four commonly used organic solvents i.e.
View Article and Find Full Text PDFInfrared Electrochemiluminescence from A Water-Soluble Anion-π Emitter for Sensitive Perfluorooctanoic Acid Sensing.
Anal Chem
January 2025
Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
Electrochemiluminescence (ECL) analysis stands out among various analytical methods due to its exceptional sensitivity and accuracy. However, the poor solubility of most ECL probes limits their effectiveness in aqueous environments. To address this challenge, we developed a water-soluble anion-π ECL luminophore, DPBC-OTS.
View Article and Find Full Text PDFInsight into the abundance and optical characteristics of water-soluble organic compounds (WSOC) in PM in urban areas.
Chemosphere
January 2025
College of Design and Engineering, National University of Singapore, Singapore, 117576, Singapore. Electronic address:
Airborne particulate matter (PM) poses significant environmental and health challenges, particularly in urban areas. This study investigated the characteristics of water-soluble organic compounds (WSOC) in PM (PM with an aerodynamic diameter of 2.5 μm or less) in Singapore, a tropical Asian city-state, over a six-month period.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!