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ammonium sulfate bertram

  • Granulation by spray coating aqueous solution of …

    by spray coating aqueous solution of ammonium sulfate to produce large spherical granules in a fluidized bed Guanda ... Ammonium sulfate ((NH4)2SO4) is an excellent fertilizer which ... Pant, Parsons, and Bertram (2006) found that 1wt% of kaolinite induced the crystalliza-tion of (NH4)2SO4 at low supersaturation. Onasch, McGraw, and

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  • Laboratory Studies of Ice Formation Pathways from Ammonium ...

    ation onto solid ammonium sulfate aerosol particles. Using a cloud chamber, they found that solid ammonium sulfate par-ticles (formed at less than 10% RH) were efficient ice nucle-ators (onset Sice=1.20 at 221K). In this experiment, Abbatt Published by Copernicus Publications on behalf of the European Geosciences Union.

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  • Importance of including ammonium sulfate ((NH SO ...

    that ammonium sulfate ((NH4)2SO4) aerosols can influence the cirrus clouds. These studies showed potential impact of ammonia and ammonium sulfate on ice clouds and that mo-tivated the present investigation. Agricultural activities, fer-tilizers and livestock contribute significantly to the ammo-

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  • Sodium aluminum sulfate dodecahydrate | AlH24NaO20S2 - …

    The above procedure was repeated on each mineral soil without a forest floor, except leaching soln were 0.5 mM calcium nitrate or calcium sulfate, each in 10 mM ammonium nitrate Adding 2 and 0.5 cmol sub c (H+)/kg to forest floor and mineral soils, respectively, simulated snowmelt additions.

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  • Ice Formation by Sulfate and Sulfuric Acid Aerosol ...

    Nov 15, 2000· Ammonium sulfate particles that entered the diffusion chamber in a liquid state froze homogeneously at relative humidities that were 10% lower than where ice nucleated on initially dry particles. ... Bertram et al. (1996) used Fourier transform infrared (FTIR) ...

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  • Allan Bertram - Google Scholar Citations

    Deliquescence and crystallization of ammonium sulfate particles internally mixed with water-soluble organic compounds MT Parsons, DA Knopf, AK Bertram The Journal of Physical Chemistry A 108 (52), 11600-11608, 2004

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  • Images reveal that atmospheric particles can undergo ...

    ammonium sulfate and SOM from the photooxidation of trime-thylbenzene appeared to have two phases at RH values up to at least 70% (Fig. 2 E and F). Several pieces of evidence indicate that the inner phase was inorganic rich and the outer phase was organic rich. First, the fluorescence signal, practically absent for pure ammonium sulfate

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  • Sea Spray Aerosol: Where Marine Biology Meets Atmospheric ...

    Dec 26, 2018· Introduction. The ocean represents one of the most abundant sources of natural aerosols, termed sea spray aerosol (SSA). 1−4 SSA is produced at the ocean surface and can be lofted into the upper troposphere, where they contribute to the global radiation budget. The scattering of solar radiation is one impact that aerosols have on climate through aerosol–radiation interactions, also known ...

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  • Solid Ammonium Sulfate Aerosols as Ice Nuclei: A Pathway ...

    Sep 22, 2006· Laboratory measurements support a cirrus cloud formation pathway involving heterogeneous ice nucleation by solid ammonium sulfate aerosols. Ice formation occurs at low ice-saturation ratios consistent with the formation of continental cirrus and an interhemispheric asymmetry observed for cloud onset. In a climate model, this mechanism provides a widespread source of ice …

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  • Crystallization of Aqueous Ammonium Sulfate Particles ...

    Using optical microscopy, we investigated the crystallization of aqueous ammonium sulfate droplets containing soot and kaolinite, as well as the crystallization of aqueous ammonium sulfate droplets free of solid material. Our results show that soot did not influence the crystallization RH of aqueous ammonium sulfate particles under our experimental conditions. In contrast, kaolinite increased ...

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  • Viscosities, diffusion coefficients, and mixing times of ...

    ing on the surface of a solution of 0.1M ammonium sulfate (>99%, EMD) in a larger, covered petri dish. Over a period of 3 to 5 days, the ammonia vapor in equilibrium with the ammonium sulfate solution (concentration estimated to be 300ppbNH3 using the Extended AIM Aerosol Thermody-namics Model II) (Clegg et al., 1998) reacted with the fresh

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  • Allan Bertram | UBC Chemistry

    Martin, S. T. ; Bertram, A. K. Comment On "effects Of The Physical State Of Tropospheric Ammonium-Sulfate-Nitrate Particles In Global Aerosol Direct Radiative Forcing". Atmospheric Chemistry and Physics 2003, 3, S2445-S2448.

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  • Liquid-liquid phase separation in atmospheric aerosol ...

    Recent studies on a limited number of model systems have shown that oxygen-to-carbon ratios (O:C) of the organic aerosol fraction might be a good predictor for LLPS in mixed organic/ammonium sulfate (AS) particles (Bertram et al., 2011; Song et al., 2011).

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  • Heterogeneous Drop Freezing in the Immersion Mode: Model ...

    The model results for the freezing temperatures T f,s of drops containing ammonium sulfate, as well as the freezing point depression ΔT f, are listed in Table 3 together with the experimental values for homogeneous freezing of solution drops from Bertram et al. (2000), which were part of the basis of the Koop et al. (2000) parameterization.

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  • Images reveal that atmospheric particles can undergo ...

    Aug 14, 2012· Bertram AK, et al. Predicting the relative humidities of liquid-liquid phase separation, efflorescence, and deliquescence of mixed particles of ammonium sulfate, organic material, and water using the organic-to-sulfate mass ratio of the particle and the oxygen-to-carbon elemental ratio of the organic component.

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  • Filling the Void - Efficiency Vermont

    Filling the Void By Fernando Pages Ruiz i ... energy used to produce it," says Bertram. Most of the serious health concerns and allegations made about fiberglass insulation have been retracted or disproved in recent years. The National Academy of Sciences ... borate and ammonium sulfate…

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  • RMetS Journals - Royal Meteorological Society (RMetS ...

    Jul 20, 2009· Table I summarizes the uptake coefficients for ammonium sulfate and ammonium hydrogen sulfate over the range 263–303 K, measured in this work. The uncertainty in the derived uptake coefficient is dominated by uncertainty in the measurement of N 2 O 5 mixing ratio within the flow tube, which was 10–20 ppbv.

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  • Acid-catalyzed reactions of hexanal on sulfuric acid ...

    Acid-catalyzed reactions of hexanal on sulfuric acid particles: Identification of reaction products Rebecca M. Garland a,b, Matthew J. Elrod c, Kristi Kincaid a, Melinda R. Beaver a,b,

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  • Ice formation in (NH4)2so4-H2O particles | Request PDF

    For example, mineral dust forms ice at 110%-120% RH (with respect to ice) (Bailey and Hallett 2002), whereas ammonium sulfate particle forms ice at 140%-170% RH (Bertram et al. 2000). Thus, in ...

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  • Incomplete sulfate aerosol neutralization despite excess ...

    ! 1 Incomplete sulfate aerosol neutralization despite excess ammonia in the eastern US: a possible role of organic aerosol Rachel F. Silvern 1, Daniel J. Jacob 1,2, Patrick S. Kim 1, Eloise A. Marais 2, and Jay R. Turner 3 5 1Department of Earth and Planetary Scien ces, Harvard University, Cambridge, MA, USA 2School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA

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  • Effects of molecular weight and temperature on liquid ...

    at 273K and 290K for particles containing ammonium sul-fate and 1,2,6-hexanetriol (Bertram et al., 2011). Schill and Tolbert, 2013 reported that SRH results were similar for tem-peratures from 240 to 265K for particles containing ammo-nium sulfate mixed with 1,2,6-hexanetriol and particles con-taining ammonium sulfate, 1,2,6-hexanetriol, and 2 ...

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  • Publications | Bertram Research Group

    You, Y., and Zorn, S.R. Predicting the relative humidities of liquid-liquid phase separation, efflorescence, and deliquescence of mixed particles of ammonium sulfate, organic material, and water using the organic-to-sulfate mass ratio of the particle and the oxygen-to-carbon elemental ratio of the organic component. Atmos. Chem.

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  • Lowering Soil pH for Horticulture Crops - Purdue Extension

    Lowering Soil pH for Horticulture Crops. Michael V. Mickelbart and Kelly M. Stanton, Purdue Horticulture and Landscape Architecture. Steve Hawkins and James Camberato, Purdue Agronomy ... Ammonium sulfate is an ammonium fertilizer that . is two to three times more acid forming per pound of nitrogen than other commonly used ammonium

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  • Ammonium sulfate precipitation - Wikipedia

    Properties. Ammonium sulfate is an inorganic salt with a high solubility that disassociates into ammonium (NH 4 +) and sulfate (SO 4 2−) in aqueous solutions. Ammonium sulfate is especially useful as a precipitant because it is highly soluble, stabilizes protein structure, has a relatively low density, is readily available, and is relatively inexpensive.

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  • Deliquescence, efflorescence, and phase miscibility of ...

    The deliquescence, efflorescence, and phase miscibility of the mixed particles were investigated using a dual arm tandem differential mobility analyzer. The isoprene photo-oxidation products induced deviations in behavior relative to pure ammonium sulfate.

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  • Nighttime enhancement of PM2.5 nitrate in ammonia-poor ...

    The nitrate concentration peaked in a bin larger than that of sulfate or ammonium peak on the event days. For example, SH-02 nitrate peaked at 0.73 μm, while sulfate and ammonium peaked at 0.43 μm; BJ-01-C nitrate peaked at 1.34 μm, whereas sulfate and ammonium concentrations reached their highest levels at 0.73 μm.

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  • 14: Influence of Organic-Containing Aerosols on Marine ...

    Bertram, A.K., et al., 2011: Predicting the relative humidities of liquid -liquid phase separation, efflorescence, and deliquescence of mixed particles of ammonium sulfate, organic material, and water using the organic-to-sulfate mass ratio of the particle and the oxygen -to-carbon elemental ratio of the organic component. Atmos. Chem.

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  • High aerosol acidity despite declining atmospheric sulfate ...

    Atmospheric sulfate levels are thought to determine the pH of small aerosol particles. Thermodynamic analysis of field aerosol data reveals that fine particles remain acidic in the southeastern ...

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  • Hygroscopic Properties and Phase ... - Bertram group website

    ammonium sulfate + malonic acid particles during deliquescence Experimental data The images are of ammonium sulfate + malonic acid particles (xMal = 0.240) during deliquescence at relative humidities of: (A) 76.3%, (B) 77.2%, (C) 77.7%, (D) 78.2%, and during crystallization at relative humidities equal to: (E) 30.4%, (F) 29.3%, (G) 29.2%, (H ...

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  • Phase State and Deliquescence Hysteresis of Ammonium ...

    (LLPS) can be parameterized for the organic-to-sulfate ratio of SOA and the oxygen-to-carbon (O/C) ratio (Bertram et al. 2011 and further elaborated by Song et al. 2012), as recently reviewed by You et al. (2014). The evolution of SOM in the atmosphere is a complex phe-nomenon, and research is now seeking to constrain the param-

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