A study of the intersystem crossing reaction induced in gaseous sulfur dioxide molecules by collisions with nitrogen and cyclohexane at 27°C

1972 ◽  
Vol 4 (2) ◽  
pp. 191-205 ◽  
Author(s):  
Abraham Horowitz ◽  
Jack G. Calvert
Keyword(s):  
Sulfur Dioxide ◽  
Intersystem Crossing ◽  
Gaseous Sulfur

Flow injection determination of gaseous sulfur dioxide with gas permeation denuder-based online sampling and preconcentration

2002 ◽  
Vol 374 (6) ◽  
pp. 1141-1146 ◽  
Author(s):  
Zhong-Xian Guo ◽  
Yuan-Zong Li ◽  
Xin-Xiang Zhang ◽  
Wen-Bao Chang ◽  
Yun-Xiang Ci
Keyword(s):  
Sulfur Dioxide ◽  
Flow Injection ◽  
Gas Permeation ◽  
Gaseous Sulfur ◽  
Online Sampling

Kinetics of the Reaction of Solid Anhydrous Potassium Carbonate with Gaseous Sulfur Dioxide

1994 ◽  
Vol 59 (11) ◽  
pp. 2357-2374 ◽  
Author(s):  
Erich Lippert ◽  
Karel Mocek ◽  
Emerich Erdös
Keyword(s):  
Sulfur Dioxide ◽  
Water Vapour ◽  
Potassium Carbonate ◽  
Anhydrous Potassium Carbonate ◽  
Heterogeneous Reaction ◽  
Fixed Bed ◽  
Partial Pressures ◽  
Flow Apparatus ◽  
Gaseous Sulfur ◽  
Kinetics Of

Results are presented of an experimental kinetic study of the heterogeneous reaction between gaseous sulfur dioxide and solid anhydrous potassium carbonate. The measurements were carried out in an all glass kinetic flow apparatus with nitrogen as the carrier gas and a fixed bed of the solid working in the differential regime at atmospheric pressure and a temperature of 423 K (150 °C). The reaction course was studied in dependence on the partial pressures of sulfur dioxide (pSO2) and water vapour (pH2O) in concentration ranges pSO2 = 13 - 430 Pa and pH2O = 0 - 2 100 Pa. In the reaction, water vapour acts as a gaseous catalyst. Based on the experimental data, the corresponding kinetic equation was found together with the numerical values of the relevant rate and equilibrium adsorption constants.

Kinetics of the Reaction Between Solid Active Sodium Carbonate of the Second Generation and the Gaseous Sulfur Dioxide

1996 ◽  
Vol 61 (8) ◽  
pp. 1141-1157 ◽  
Author(s):  
Květoslava Stejskalová ◽  
Zdeněk Bastl ◽  
Karel Mocek
Keyword(s):  
Sulfur Dioxide ◽  
Kinetic Study ◽  
Sodium Carbonate ◽  
Reaction Rate ◽  
Second Generation ◽  
Surface Composition ◽  
Fixed Bed Reactor ◽  
Active Sodium ◽  
Before And After ◽  
Gaseous Sulfur

The results are presented of a detailed experimental kinetic study of the heterogeneous reaction between gaseous sulfur dioxide and the solid active sodium carbonate of the second generation which has been prepared by a controlled thermal dehydration of higher hydrates of the sodium carbonate. The measurements have been carried out in an all-glass kinetic apparatus with an integral fixed-bed reactor. The reaction course was studied in dependence on genesis and nature of the active sodium carbonate, on temperature and on composition of the gas phase. The reaction rate is significantly affected by presence of the water vapour which acts as a gaseous catalyst. Experimental data have been treated by using the model proposed by Erdos (Collect. Czech. Chem. Commun. 32, 1653 (1967), and the values of the effective reaction rate constants have been computed. The kinetic study of active sodium carbonate of the second generation has been completed by the determination of microstructure (SEM) of solid samples before and after reaction, and by determining the solid surface composition before and after reaction by means of electronic spectra (ESCA).

scholarly journals Concentrations of Atmospheric Sulfur Compounds in an Extremely Snowy Region, the Hokuriku District, Japan

2004 ◽  
Vol 4 ◽  
pp. 248-255
Author(s):  
Tomonori Kawakami ◽  
Jun Murayama
Keyword(s):  
Sulfur Dioxide ◽  
Aerosol Particles ◽  
Sulfur Compounds ◽  
Cloud Base ◽  
Spatial Spread ◽  
Seasonal Characteristics ◽  
Lower Cloud ◽  
Spread Pattern ◽  
Gaseous Sulfur ◽  
Local Emissions

The diurnal and seasonal characteristics in gaseous sulfur dioxide and sulfate in aerosol particles, as well as the concentrations of sulfate in rain and snow, were measured in the Hokuriku District, Japan in order to investigate the spatial spread pattern of sulfur compounds and identify the origin of sulfur. The concentration of sulfur dioxide showed a distinct diurnal pattern, while the concentrations of nss-SO42−in precipitation and aerosol particles did not. These results implied that the sulfur dioxide might originate in local emissions and did not affect the concentration of nss-SO42−in precipitation, while nss-SO42−in aerosol particles seemed to be widespread and might result from long-range transportation. The deposition of nss-SO42−in precipitation increased in winter, while the concentration of nss-SO42−in aerosol particles decreased. This could be attributed to the lower cloud base often observed in this district in winter associated with a higher washout ratio.

Vasodilator effect of gaseous sulfur dioxide and regulation of its level by Ach in rat vascular tissues

2009 ◽  
Vol 00 (00) ◽  
pp. 091015011134021-6
Author(s):  
Ziqiang Meng ◽  
Junling Li ◽  
Quanxi Zhang ◽  
Weiming Bai ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Vasodilator Effect ◽  
Vascular Tissues ◽  
Gaseous Sulfur

Adding Sulfur Dioxide (SO2)

2018 ◽  
Author(s):  
David R. Dalton
Keyword(s):  
Carbon Dioxide ◽  
Sulfur Dioxide ◽  
Safety Data ◽  
White Wine ◽  
Sodium Metabisulfite ◽  
Quality Grade ◽  
Grape Skins ◽  
Gaseous Sulfur ◽  
Carbon Dioxide Co2 ◽  
Liquefied Gas

The judicious use of sulfur dioxide (SO2) will inhibit the growth of microorganisms (e.g., bacteria) present on the grape skins as the berries come from the vineyard. Its early use presumes the vintner has decided that the adventitious wild yeasts which might be destroyed or inhibited by sulfur dioxide will not contribute to the vintage. It appears that Saccharomyces cerevisiae might be less susceptible to the action of sulfur dioxide than other yeasts that may be present. So, if the particular strain of S. cerevisiae used can cope, it may be able to function unimpeded. Regardless, sulfur dioxide might still be used because, in addition to suppression of deleterious microorganisms, it appears to reduce oxidation of particularly fragile white wine components. In industrial settings, both gaseous sulfur dioxide and sulfur dioxide as a liquefied gas (boiling point – 10 °C [14 °F]) are used. In either form it is a dangerous tool. It is dangerous first because it is toxic and second because an excess of it will ruin the wine. In many cases, because its value is recognized as beneficial, sulfur dioxide is replaced by addition of either sodium metabisulfite (Na2S2O5) or potassium metabisulfite (K2S2O5) with the latter generally preferred. Indeed, while it is best to look at the MSDS. (Manufacturer’s Safety Data Sheet) before use, the solubility of the two salts is the same and given as 450 grams/ liter (g/ L) at 68 °F (20 °C) and the pH on dissolution as between 3.5 and 4.5. The potassium (K) salt appears, at this writing, to be more readily available in food quality (as opposed to chemical quality) grade. So, with regard to sulfur dioxide (SO2), and as shown in Figure 17.1, its structure is much more similar to water and to ozone than it is to carbon dioxide (CO2); sulfur lies beneath oxygen (O2) in the periodic table (silicon, Si, lies beneath carbon). Nonetheless, sulfur dioxide (SO2) reacts with water much the same way that carbon dioxide (CO2) does.

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