ChemInform Abstract: Gas-Phase Deprotonation Energies of Sulfuric Acid, Perchloric Acid, Chlorosulfuric Acid and Fluorosulfuric Acid

ChemInform ◽  
2010 ◽  
Vol 29 (8) ◽  
pp. no-no
Author(s):  
A. H. OTTO ◽  
S. SCHRADER ◽  
T. STEIGER ◽  
M. SCHNEIDER
Keyword(s):  
Sulfuric Acid ◽  
Gas Phase ◽  
Perchloric Acid

Gas-phase deprotonation energies of sulfuric acid, perchloric acid, chlorosulfuric acid and fluorosulfuric acid

1997 ◽  
Vol 93 (22) ◽  
pp. 3927-3930 ◽  
Author(s):  
Andre´ H. Otto ◽  
Sigurd Schrader ◽  
Thomas Steiger ◽  
Matthias Schneider
Keyword(s):  
Sulfuric Acid ◽  
Gas Phase ◽  
Perchloric Acid

scholarly journals Hygroscopic properties of ultrafine aerosol particles in the boreal forest: diurnal variation, solubility and the influence of sulfuric acid

2007 ◽  
Vol 7 (1) ◽  
pp. 211-222 ◽  
Author(s):  
M. Ehn ◽  
T. Petäjä ◽  
H. Aufmhoff ◽  
P. Aalto ◽  
K. Hämeri ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Boreal Forest ◽  
Diurnal Variation ◽  
Gas Phase ◽  
Aerosol Particles ◽  
Particle Formation ◽  
Time Of Day ◽  
New Particle Formation ◽  
Hygroscopic Growth ◽  
Hygroscopic Properties

Abstract. The hygroscopic growth of aerosol particles present in a boreal forest was measured at a relative humidity of 88%. Simultaneously the gas phase concentration of sulfuric acid, a very hygroscopic compound, was monitored. The focus was mainly on days with new particle formation by nucleation. The measured hygroscopic growth factors (GF) correlated positively with the gaseous phase sulfuric acid concentrations. The smaller the particles, the stronger the correlation, with r=0.20 for 50 nm and r=0.50 for 10 nm particles. The increase in GF due to condensing sulfuric acid is expected to be larger for particles with initially smaller masses. During new particle formation, the changes in solubility of the new particles were calculated during their growth to Aitken mode sizes. As the modal diameter increased, the solubility of the particles decreased. This indicated that the initial particle growth was due to more hygroscopic compounds, whereas the later growth during the evening and night was mainly caused by less hygroscopic or even hydrophobic compounds. For all the measured sizes, a diurnal variation in GF was observed both during days with and without particle formation. The GF was lowest at around midnight, with a mean value of 1.12–1.24 depending on particle size and if new particle formation occurred during the day, and increased to 1.25–1.34 around noon. This can be tentatively explained by day- and nighttime gas-phase chemistry; different vapors will be present depending on the time of day, and through condensation these compounds will alter the hygroscopic properties of the particles in different ways.

scholarly journals Uptake of gas-phase alkylamines by sulfuric acid

2011 ◽  
Vol 56 (12) ◽  
pp. 1241-1245 ◽  
Author(s):  
Shi Yin ◽  
MaoFa Ge ◽  
WeiGang Wang ◽  
Ze Liu ◽  
DianXun Wang
Keyword(s):  
Sulfuric Acid ◽  
Gas Phase

scholarly journals Atmospheric new particle formation at the research station Melpitz, Germany: connection with gaseous precursors and meteorological parameters

2018 ◽  
Vol 18 (3) ◽  
pp. 1835-1861 ◽  
Author(s):  
Johannes Größ ◽  
Amar Hamed ◽  
André Sonntag ◽  
Gerald Spindler ◽  
Hanna Elina Manninen ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Solar Radiation ◽  
Gas Phase ◽  
Meteorological Parameters ◽  
Particle Formation ◽  
Number Concentration ◽  
Independent Effect ◽  
Research Station ◽  
New Particle Formation ◽  
Automated Method

Abstract. This paper revisits the atmospheric new particle formation (NPF) process in the polluted Central European troposphere, focusing on the connection with gas-phase precursors and meteorological parameters. Observations were made at the research station Melpitz (former East Germany) between 2008 and 2011 involving a neutral cluster and air ion spectrometer (NAIS). Particle formation events were classified by a new automated method based on the convolution integral of particle number concentration in the diameter interval 2–20 nm. To study the relevance of gaseous sulfuric acid as a precursor for nucleation, a proxy was derived on the basis of direct measurements during a 1-month campaign in May 2008. As a major result, the number concentration of freshly produced particles correlated significantly with the concentration of sulfur dioxide as the main precursor of sulfuric acid. The condensation sink, a factor potentially inhibiting NPF events, played a subordinate role only. The same held for experimentally determined ammonia concentrations. The analysis of meteorological parameters confirmed the absolute need for solar radiation to induce NPF events and demonstrated the presence of significant turbulence during those events. Due to its tight correlation with solar radiation, however, an independent effect of turbulence for NPF could not be established. Based on the diurnal evolution of aerosol, gas-phase, and meteorological parameters near the ground, we further conclude that the particle formation process is likely to start in elevated parts of the boundary layer rather than near ground level.

scholarly journals Chemical ionization mass spectrometry (CIMS) may not measure all gas-phase sulfuric acid if base molecules are present

2010 ◽  
Vol 10 (12) ◽  
pp. 30539-30568
Author(s):  
T. Kurtén ◽  
T. Petäjä ◽  
J. Smith ◽  
I. K. Ortega ◽  
M. Sipilä ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Gas Phase ◽  
Chemical Ionization ◽  
Measurement Data ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Proton Affinities ◽  
Reaction Thermodynamics

Abstract. The state-of-the art method for measuring atmospheric gas-phase sulfuric acid is chemical ionization mass spectrometry (CIMS) based on nitrate reagent ions. Using computed proton affinities and reaction thermodynamics for the relevant charging reactions, we show that in the presence of strong bases such as amines, which tend to cluster with the sulfuric acid molecules, a significant fraction of the total gas-phase sulfuric acid may not be measured by a CIMS instrument. If this is the case, this effect has to be taken into account in the interpretation of atmospheric sulfuric acid measurement data, as well as in intercomparison of different CIMS instruments, which likely have different susceptibilities to amine-sulfuric acid clustering.

scholarly journals Ab Initio and Density Functional Theory Reinvestigation of Gas-Phase Sulfuric Acid Monohydrate and Ammonium Hydrogen Sulfate

2006 ◽  
Vol 110 (22) ◽  
pp. 7178-7188 ◽  
Author(s):  
Theo Kurtén ◽  
Markku R. Sundberg ◽  
Hanna Vehkamäki ◽  
Madis Noppel ◽  
Johanna Blomqvist ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Sulfuric Acid ◽  
Ab Initio ◽  
Gas Phase ◽  
Density Functional ◽  
Hydrogen Sulfate ◽  
Functional Theory ◽  
Ammonium Hydrogen ◽  
Ammonium Hydrogen Sulfate

Distinct particle modes in the lower stratosphere constrain secondary aerosol chemistry and gas-phase concentrations

2021 ◽  
Author(s):  
Daniel Murphy ◽  
Karl Froyd ◽  
Greg Schill ◽  
Charles Brock ◽  
Agnieszka Kupc ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Gas Phase ◽  
Lower Stratosphere ◽  
Aerosol Particles ◽  
Organic Content ◽  
Aerosol Chemistry ◽  
Volatile Organics ◽  
Organic Sulfate ◽  
Concentration Limits ◽  
Distinct Particle

<p>There are distinct types of aerosol particles in the lower stratosphere. Stratospheric sulfuric acid particles with and without meteoric metals coexist with mixed organic-sulfate particles that originated in the troposphere. That these particles remain distinct has important implications for aerosol chemistry and the concentrations of several gas-phase species. Neither semi-volatile organics nor ammonia can be in equilibrium with the gas phase. The gas-phase concentrations of semi-volatile organics and ammonia must be very low, or else the sulfuric acid particles would not stay so pure. The upper concentration limits are around a pptv. Yet the sulfuric acid particles in the Northern Hemisphere show a very small but measurable uptake of organics and ammonia, indicating non-zero gas-phase concentrations of those species. Finally, the organic-sulfate particles must be resistant to photochemical loss, or else they would no longer retain their organic content.</p>

The Determination of Iodine in Biologic Material

1964 ◽  
Vol 10 (9) ◽  
pp. 799-823 ◽  
Author(s):  
H Hoch ◽  
S L Sinnett ◽  
T H McGavack
Keyword(s):  
Sulfuric Acid ◽  
Sulfate Reduction ◽  
Perchloric Acid ◽  
Healthy Subjects ◽  
Test Sample ◽  
Chloric Acid ◽  
Total Serum ◽  
Acid Digestion ◽  
Reduction Test

Abstract The chloric acid digestion of serum, followed by the ceric sulfate reduction test for iodine has been shown to give results reproducible to within ± 0.00035 µg. iodine per test sample (1) if the entire digestion tubes are kept hot during the combustion step so that products of incomplete oxidation are vaporized, (2) if the perchloric acid and sulfuric acid concentrations in the final digest are adjusted to 1.64 normal (16.5%) and 0.37 normal, respectively, (3) if attention is paid to the order of addition of the reagents, and (4) if the arsenite reagent is added within a fraction of a second. The method gave values for total serum iodine in 20 healthy subjects between 5 and 10.5 µg./100 ml.

Theoretical Studies on Mechanism and Rate Constant of Gas Phase Hydrolysis of Glyoxal Catalyzed by Sulfuric Acid

2016 ◽  
Vol 29 (3) ◽  
pp. 335-343 ◽  
Author(s):  
Ming-qiang Huang ◽  
Shun-you Cai ◽  
Ying-min Liao ◽  
Wei-xiong Zhao ◽  
Chang-jin Hu ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Gas Phase ◽  
Rate Constant ◽  
Theoretical Studies ◽  
Hydrolysis Of
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