Absorption of SO<sub>2</sub> from Air. Oxidation in Drops Containing Dissolved Catalysts

Johnstone, H. F.; Coughanowr, D. R.

doi:10.1021/ie50584a039

Cited by 88 publications

(19 citation statements)

References 3 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the one hand, more water could decrease light scattering by favoring large particles. Johnstone 7 showed that the H2SO4 content is proportional to 1/r 3 where r is the radius of the drop. Thus, the large drops contain a larger fraction of water or, conversely, a smaller fraction of sulfuric acid.…”

Section: Effect Of Absolute Wafer Concentration On So 2 -Lnduced Aeromentioning

confidence: 99%

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Harkins¹,

Nicksic²

1965

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

Section: Effect Of Absolute Wafer Concentration On So 2 -Lnduced Aeromentioning

confidence: 99%

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Harkins¹,

Nicksic²

1965

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

“…Experiments have shown that of all the metals found in the atmosphere, Mn salts were the most effective in promoting SO2 oxidation (Junge and Ryan, 1958;Johnstone and Coughanowr, 1958;Matteson et al, 1969). Although Mn salts are the best known catalyst for SO2 oxidation, the concentration of these salts in the atmosphere is still not great enough to account for the sulfate content in rain.…”

Section: Washout and Rainout O F So2mentioning

confidence: 99%

Global emissions and natural processes for removal of gaseous pollutants

Rasmussen

Mohebbi

Kabel

1975

Water Air Soil Pollut

View full text Add to dashboard Cite

Abstract. This review briefly illustrates the state of the art in the recognition of the various sources and natural sinks of gaseous pollutants. The removal mechanisms include absorption by vegetation, soil, stone, and water bodies, precipitation scavenging, and chemical reactions within the atmosphere. The nature and magnitude of anthropogenic and natural emissions of the gases (H2S, SO2, N20, NO, NO2, NH3, CO, 08, and hydrocarbons), along with their ambient background concentrations and information on their major sinks identified to date, are discussed. IntroductionThe recent interest in air pollution modeling is based on its potential value in nearly all practical problems involving quantitative consideration of air quality relative to the source location and emission rates. These include the forecasting of undesirable levels of pollution, abatement strategies, long range air resource management programs and urban planning.While considerable effort has been devoted to characterizing emissions from anthropogenic sources and their turbulent transport and convection, very little has been done to determine the extent of emission from natural sources and to characterize the processes that clean the atmosphere. Therefore, for a more realistic air pollution model, it is necessary to quantify natural emissions and removal mechanisms. The purpose of this study is to provide quantitative information on source and removal mechanisms so that a realistic air pollution model can be constructed.Pollutants may be emitted to the atmosphere from many diffuse natural and anthropogenic sources. The natural sources of many gases as shown in Table I far exceed the anthropogenic sources on a global basis. However, because such gases are usually well distributed throughout the atmosphere their concentration, known as the background concentration, is extremely low. Anthropogenic sources of many pollutants are cen-* All associated with

show abstract

“…This is due to the presAugust 1974 ence of other air contaminants which in general greatly facilitate the oxidation of sulfur dioxide. Two processes appear to be involved: oxidation by components derived from photochemical processes (7)(8)(9)(10)(11)(12)34) and catalytic oxidation predominantly by certain types of particulate aerosols (13)(14)(15)(16)(17)(18)(19)(20)(21) Table 4.…”

Section: Summary Of Key Problemsmentioning

confidence: 99%

Review of the Health Effects of Sulfur Oxides

Rall¹

1974

Environmental Health Perspectives

View full text Add to dashboard Cite

The pollution in the air is a complex mixture of chemical substances of varying toxicity of which the sulfur oxides are a principal component. Those components which pose the primary hazards to human health have not yet been fully identified, nor have their respective contributions to human disease been fully determined. Efficient and effective control strategies are dependent upon the identification and understanding of these toxic components. Ultimately, the goal of standard-setting should be the development of composite pollution indices rather than control of individual pollutants.Concentrations of SO2' in the ambient air twice the current standards are associated with adverse health effects. A consider'able body of evidence suggests that there may be discernible human health effects from exposure to concentrations approximating the current standards. There is therefore no basis for'relaxation of the present standards for sulffr oxides at this time. Since the scientific basis for this judgment is incomplete, further scientific'information will, be required either to validate the present standards or to justify alteration of these standards. and experimental or laboratory studies, including matters of agreement or disagreement among the findings produced by the various study approaches; (3) the variable susceptibility to adverse effects' of sulfur oxides among different population groups; (4) a quantification of health effects in relation to various levels of exposure; and (5) the relationship between various levels of sulfur oxide exposure and costs in terms of impaired health, including the costs of care and loss of productivity among those who are or may be adversely affected by exposure to sulfur oxides. Review of Health Effects of Sulfur OxidesThis study has examined the existing scientific information and answered, insofar as is possible, these important questions. It is clear that additional information on the health effects of sulfur oxides is urgently needed. A program of research studies designed to develop such information is therefore included. Summary of Available InformationThe chemical form of sulfur oxides in the ambient air which is associated' in epidemiological studies with morbidity and mortality has not yet been clearly identified. The sulfur-containing products which have been implicated include SO2, sulfuric acid, and inorganic sulfates. SO, gas is generated primarily by the process of burning fossil fuels containing sulfur. SO remains in the ambient air for 1-7 days, during which time it can be converted to sulfates and sulfuric acid by sunlight, photochemical oxidants, or by the catalytic effect of certain particulates in the air. These processes are complex and not quantitatively understood. SO in the ambient air therefore provides a reservoir from which the more toxic sulfates and sulfuric acid derive. On a nationwide basis, the average ambient air concentrations of SO2 have been decreasing in the last few years because fossil fuels with a lower sulfur content have been used. The co...

show abstract

Absorption of SO₂ from Air. Oxidation in Drops Containing Dissolved Catalysts

Cited by 88 publications

References 3 publications

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Global emissions and natural processes for removal of gaseous pollutants

Review of the Health Effects of Sulfur Oxides

Contact Info

Product

Resources

About

Absorption of SO2 from Air. Oxidation in Drops Containing Dissolved Catalysts

Cited by 88 publications

References 3 publications

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Studies on the Role of Sulfur Dioxide in Visibility Reduction

Global emissions and natural processes for removal of gaseous pollutants

Review of the Health Effects of Sulfur Oxides

Contact Info

Product

Resources

About

Absorption of SO₂ from Air. Oxidation in Drops Containing Dissolved Catalysts