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1. Formation and Evolution of aqSOA from Aqueous-Phase Reactions of Phenolic Carbonyls: Comparison between Ammonium Sulfate and Ammonium Nitrate Solutions

   https://doi.org/10.1021/acs.est.8b03441  

   Huang, Dan Dan ; Zhang, Qi ; Cheung, Heidi H. ; Yu, Lu ; Zhou, Shan ; Anastasio, Cort ; Smith, Jeremy D. ; Chan, Chak K. ( July 2018 , Environmental Science & Technology)
2. Kinetics, Products, and Brown Carbon Formation by Aqueous-Phase Reactions of Glycolaldehyde with Atmospheric Amines and Ammonium Sulfate

   https://doi.org/10.1021/acs.jpca.2c02606  

   Rodriguez, Alyssa A. ; Rafla, Michael A. ; Welsh, Hannah G. ; Pennington, Elyse A. ; Casar, Jason R. ; Hawkins, Lelia N. ; Jimenez, Natalie G. ; de Loera, Alexia ; Stewart, Devoun R. ; Rojas, Antonio ; et al ( August 2022 , The Journal of Physical Chemistry A)
3. Solubility of the Sodium and Ammonium Salts of Oxalic Acid in Water with Ammonium Sulfate

   https://doi.org/10.1021/acs.jpca.6b05208  

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4. Cellulose Sulfate Nanofibers for Enhanced Ammonium Removal

   https://doi.org/10.3390/nano14060507  

   Johnson, Ken I. ; Borges, William ; Sharma, Priyanka R. ; Sharma, Sunil K. ; Chang, Hao-Yen ; Abou-Krisha, Mortaga M. ; Alhamzani, Abdulrahman G. ; Hsiao, Benjamin S. ( March 2024 , Nanomaterials)

   In this study, a sulfonation approach using chlorosulfonic acid (CSA) to prepare cellulose sulfate nanofibers (CSNFs) from raw jute fibers is demonstrated. Both elemental sulfur content and zeta potential in the CSNFs are found to increase with increasing CSA content used. However, the corresponding crystallinity in the CSNFs decreases with the increasing amount of CSA used due to degradation of cellulose chains under harsh acidic conditions. The ammonium adsorption results from the CSNFs with varying degrees of sulfonation were analyzed using the Langmuir isotherm model, and the analysis showed a very high maximum ammonium adsorption capacity (41.1 mg/g) under neutral pH, comparable to the best value from a synthetic hydrogel in the literature. The high ammonium adsorption capacity of the CSNFs was found to be maintained in a broad acidic range (pH = 2.5 to 6.5).

    

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5. Solid organic-coated ammonium sulfate particles at high relative humidity in the summertime Arctic atmosphere

   https://doi.org/10.1073/pnas.2104496119  

   Kirpes, Rachel M. ; Lei, Ziying ; Fraund, Matthew ; Gunsch, Matthew J. ; May, Nathaniel W. ; Barrett, Tate E. ; Moffett, Claire E. ; Schauer, Andrew J. ; Alexander, Becky ; Upchurch, Lucia M. ; et al ( April 2022 , Proceedings of the National Academy of Sciences)

   The ability of atmospheric aerosols to impact climate through water uptake and cloud formation is fundamentally determined by the size, composition, and phase (liquid, semisolid, or solid) of individual particles. Particle phase is dependent on atmospheric conditions (relative humidity and temperature) and chemical composition and, importantly, solid particles can inhibit the uptake of water and other trace gases, even under humid conditions. Particles composed primarily of ammonium sulfate are presumed to be liquid at the relative humidities (67 to 98%) and temperatures (−2 to 4 °C) of the summertime Arctic. Under these atmospheric conditions, we report the observation of solid organic-coated ammonium sulfate particles representing 30% of particles, by number, in a key size range (<0.2 µm) for cloud activation within marine air masses from the Arctic Ocean at Utqiaġvik, AK. The composition and size of the observed particles are consistent with recent Arctic modeling and observational results showing new particle formation and growth from dimethylsulfide oxidation to form sulfuric acid, reaction with ammonia, and condensation of marine biogenic sulfate and highly oxygenated organic molecules. Aqueous sulfate particles typically undergo efflorescence and solidify at relative humidities of less than 34%. Therefore, the observed solid phase is hypothesized to occur from contact efflorescence during collision of a newly formed Aitken mode sulfate particle with an organic-coated ammonium sulfate particle. With declining sea ice in the warming Arctic, this particle source is expected to increase with increasing open water and marine biogenic emissions. 

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