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Effects of sulfuric acid and ammonium sulfate coatings on ...

Martin et al. showed using spectroscopy that sulfate anions chemisorbed to a range of metal oxide surfaces even in ammonium sulfate solutions. Therefore it seems likely that the sulfate anions are also interacting with the kaolinite surface in our (NH 4) ... Allan K. Bertram and Keng C. Chou, ...

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Allan Bertram | UBC Chemistry

This site offers the rare opportunity of nearly yearround measurements of tropospheric air unaffected by local background. This project is a collaboration with researchers at UBC (Allan Bertram and Ian McKendry), Environment Canada (Anne Marie MacDonald and Richard Leaitch) and Pacific Northwest National Laboratory (Daniel Cziczo).

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Inconsistency of ammonium–sulfate aerosol ratios with ...

namic models. The ammonium–sulfate ratio averages only in the Southeast, even though ammonia is in large excess, as shown by the ammonium–sulfate ratio in wet deposition and by the presence of gasphase ammonia. It further appears that the ammonium–sulfate aerosol ratio is insensitive to the supply of ammonia, remaining low

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Lelia N. Hawkins Publications | Harvey Mudd College

HMC Faculty Publications (Undergraduate coauthors are denoted by an asterisk) Hawkins, L. N., H. G. Welsh*, M. V. Alexander* (2018), Evidence for pyrazinebased chromophores in cloudwater mimics containing methylglyoxal and ammonium sulfate, Atmospheric Chemistry and Physics, 18, 1241312431, doi: /acp1812413, available spectral data (Drive).

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

ammonium sulfate (NH4)2SO4 aerosols in McRASAC and its influence on the optical properties of both liquid and ice clouds. First an (NH4)2SO4 parameterization was included in the APM to assess its effect on clouds vis`avis that of the other aerosols. Subsequently, several evaluation tests were conducted over the ARM Southern Great Plain (SGP ...

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Importance of watersoluble organic acid on the ...

Zardini et al. (2008) applied the EDB and HTDMA technologies to study the mixed system of ammonium sulfate and citric acid with varying molar ratios. They also found the lower water uptake of (1:1, molar ratio) ammonium sulfate/citric acid mixed particles compared to the ZSR predictions.

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RSC CP C3CP51595H 3.

water, ammonium sulfate, and organics from the ozone Fig. 1 Equilibrium phases and particle morphologies for the system of apinene SOA (ozone oxidation), ammonium sulfate, and water, as the relative humidity of the surrounding air cycles between high and low values. (a) Liquid–liquid or liquid–solid phase separation.

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Granulation by spray coating aqueous solution of …

Granulation by spray coating aqueous solution of ammonium sulfate to produce large spherical granules in a fluidized bed 1 2 Guanda Wang, Q1 Ling Yang, Rui Lan, Tingjie Wang∗, Yong Jin 3 Department 4 of Chemical Engineering, Tsinghua University, Beijing 100084, China 5 a 6 r t i c l e i n f o 7 Article 8 history: Received 9 9 July 2012 ...

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14: Influence of OrganicContaining Aerosols on Marine ...

Bertram, , 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 organictosulfate mass ratio of the particle and the oxygen tocarbon elemental ratio of the organic component. Atmos. Chem.

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Inhibition of efflorescence in mixed organic–inorganic ...

It is now well recognized that mixed organic–inorganic particles are abundant in the atmosphere. While there have been numerous studies of efflorescence of mixed organic–inorganic particles close to 293 K, there are only a few at temperatures less than 273 K. Understanding the efflorescence properties of the

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Daniel Knopf Stony Brook University

Daniel KnopF, Associate Professor ... D. A., Lopez, M. D. Homogeneous Ice Freezing Temperatures and Ice Nucleation Rates of Aqueous Ammonium Sulfate and Aqueous Levoglucosan Particles for Relevant Atmospheric Conditions ... D. A., Bertram, A. K., Deliquescence and Crystallization of Ammonium Sulfate ...

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New Source Performance Standards in Region 7 | Permitting ...

New Source Performance Standards (NSPS) are applicable requirements under the Title V operating permit program. This is a resource for permit writers and reviewers to learn about the rules and explore other helpful tools.

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Effects of sulfuric acid and ammonium sulfate coatings on ...

This research should be useful when trying to determine if anthropogenic emissions of SO2 and NH3 affect climate by influencing natural ice nuclei such as mineral dust. Wheeler, B. J. Murray, E. Girard, and A. K. Bertram (2009), Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles, Geophys.

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Contact efflorescence as a pathway for crystallization of ...

Dec 29, 2015· Soluble inorganic crystalline particles were used as contact nuclei to induce efflorescence of aqueous ammonium sulfate [(NH 4) 2 SO 4], sodium chloride (NaCl), and ammonium nitrate (NH 4 NO 3), with efflorescence being observed in several cases close to their deliquescence RH values (80%, 75%, and 62%, respectively). To our knowledge, these ...

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Airborne Particulate Monitoring NIST

Allan Bertram, University of British Columbia . I have included here examples of aerosol particle found in the atmosphere. They include surfuric acid water droplets, produce\൤ by the oxidation of SO2 in the atmosphere, ammonium sulfate produced by neutralization of sulfuric acid particles and organic aerosols produced by the oxidatoin of ...

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Ice Formation by Sulfate and Sulfuric Acid Aerosol ...

transition of ammonium sulfate and sulfuric acid by different techniques. Bertram et al. (1996) used Fourier transform infrared (FTIR) extinction spectroscopy to measure the freezing temperatures of liquid sulfuricacid droplets in a cooled flow tube. They found polydisperse sulfuric acid droplets (average diameter of mm) su

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Hygroscopic and phase separation properties of ammonium ...

cal potential of ammonium sulfate, explains the decrease in DRH and ERH values with the increase of organic concentration for certain organics. Thus, as the concentration of organics increases, DRH decreases to maintain unity solution saturation with respect to ammonium sulfate and ERH decreases to maintain critical supersaturation (Bertram ...

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Publications | Bertram Research Group

You, and Zorn, Predicting the relative humidities of liquidliquid phase separation, efflorescence, and deliquescence of mixed particles of ammonium sulfate, organic material, and water using the organictosulfate mass ratio of the particle and the oxygentocarbon elemental ratio …

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Hygroscopic growth of ammonium sulfate/dicarboxylic acids ...

The influence of these organics on the chemical and physical properties of sulfate aerosols is not fully established. We have measured the water activity of pure dicarboxylic acids and eutonic mixtures of ammonium sulfate/dicarboxylic acids at 25°C and have calculated van't …

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Ammonium sulfate | (NH4)2SO4 PubChem

Ammonium sulfate did not affect pulmonary function when 17 healthy humans were exposed for 16 min to and 1 mg/cu m ammonium sulfate (calculated as H2SO4). In asthmatics of the same age no symptoms occurred after exposure, however, slight effects on pulmonary function were reported.

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SOLID PART

Albert L. Bertram ABSTRACT: Minol II ('40% TNT, 40% ammonium nitrate, 20% aluminum) is useful as an explosive fill for bombs, because its use substitutes cheap, and abundant, ammonium nitrate (AN) for more expensive, and sometimes scarce, TNT. However, Minol II exhibits poor dimensional stability when exposed to temperature cycles during storage.

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Traditional Methods for Whey Protein Isolation and ...

Traditional Methods for Whey Protein Isolation and Concentration: Effects on Nutritional Properties and Biological Activity 371 Protein molecular size Figure 1 shows the results of SDSPAGE of whey protein concentrate products and cheese whey. Significant differences among these samples were found. Ultrafiltration offers the fun

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Hygroscopic Properties and Phase Transitions of ...

The phase and water content govern the total mass of airborne particles, the amount of light they scatter and absorb, and their reactivity. We are currently studying these phase transitions for a range of atmospheric condition to incorporation into atmospheric models.

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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 icesaturation ratios consistent with the formation of continental cirrus and an interhemispheric asymmetry observed for cloud onset. ... A. K. Bertram, D. D. Paterson, J. J ...

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Deliquescence, efflorescence, and phase miscibility of ...

ence of NOx can decrease the DRH of ammonium sulfate by at least 5%, though the exact decrease was not quantified. Bertram et al. (2011) likewise presented an initial data set for the effects of SOM produced by isoprene photooxidation on the phase transitions of ammonium sulfate, showing a decrease in DRH for organic volume fractions from 0 ...

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How to make a Straw Bale Garden | The Home Depot Community

Blood Meal (for organic gardening) or High Nitrogen Fertilizer such as Ammonium Sulfate (for conventional gardening) Step 1: Tip bales on the sides keeping the strings facing out. Step 2: Conditioning process Keep the bales moist for the first two three weeks. Days 46 sprinkle each bale with a ½ c of blood meal or a high nitrogen ...

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Deliquescence and crystallization of ammonium sulfate ...

Deliquescence and crystallization of ammonium sulfate‐glutaric acid and sodium chloride‐glutaric acid particles. Atul Pant. Dept. of Chemistry, the Univ. of British Columbia, Vancouver, B. C., Canada ... Scot T. Martin and Allan K. Bertram, Liquid–liquid phase separation in atmospherically relevant particles consisting of organic species ...

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Granulation by spray coating aqueous solution of ammonium ...

Spherical 2–4 mm granules of ammonium sulfate (NH 4) 2 SO 4 are promising fertilizer for practical use, though only much smaller grains are being produced in industry. This work used coating granulation to produce large spherical granules of (NH 4) 2 SO 4 in a fluidized bed by spraying its aqueous solution onto – mm (NH 4) 2 SO 4 core particles. However, the overall coating ...

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Ammonium sulfate | SigmaAldrich

Ammonium sulfate, analytical standard, for Nitrogen Determination According to Kjeldahl Method, traceable to NIST SRM 194, RES1427AA7 Ammonium sulfate, PharmaGrade, NF, Manufactured under appropriate GMP controls for pharma or biopharmaceutical production.,

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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.

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Effects of molecular weight and temperature on liquid ...

at 273K and 290K for particles containing ammonium sulfate and 1,2,6hexanetriol (Bertram et al., 2011). Schill and Tolbert, 2013 reported that SRH results were similar for temperatures from 240 to 265K for particles containing ammonium sulfate mixed with 1,2,6hexanetriol and particles containing ammonium sulfate, 1,2,6hexanetriol, and 2 ...

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Incomplete sulfate aerosol neutralization despite excess ...

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

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Effects of sulfuric acid and ammonium sulfate coatings on ...

Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles; ... (2009), Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles, Geophys. Res. Lett., 36, L02811, doi: /2008GL035997. URL ://000262981800002:

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