The ChemicalNatureof theParticipatein IrradiatedAutomobile Exhaust

Water-soluble organics in atmospheric particles: A critical review of the literature and application of thermodynamics to identify candidate compounds

“…Nonetheless, even some of the earliest studies suggested that secondary organics may contain substantial quantities of both polar and nonpolar compounds. For instance, Renzetti and Doyle (1959) found that irradiating automobile exhaust produced PM containing on an average approximately 20% water-soluble organics and 50% ether-soluble organics.…”

Studies on the Role of Sulfur Dioxide in Visibility Reduction

“…In early analyses of particulate matter in the atmosphere, Renzetti 21 found that high concentrations of organic matter, together with nitrate and sulfate, were present. Prager 9 and Reckner and Scott 22 found that certain olefins irradiated alone caused visibility reduction.…”

“…The question is, "Of what importance is this in explaining the loss of visibility in smoggy atmospheres such as in the Los Angeles Basin?" Viewpoints range from that of McCabe, 18 who said that sulfur dioxide is of negligible importance, to the hypotheses of Renzetti and Doyle 21 that sulfur dioxide may be essential to the production of visibility reducing aerosols. Wayne, 16 in a technical progress report (issued by the Los Angeles Air Pollution District), feels that no definitive answer as to whether sulfur dioxide plays an essential role in the photochemical generation of aerosols can be given.…”

Photo-Oxidation of Sulfur Dioxide

“…+ 14 it is reasonable to assume that ki > fc 3 . Also, k 2 < ki because intersystem crossing is not favored.…”

“…The low temperature cell was fitted with a quartz outer window. Some photolyses of SO 2 in the solid phase at 77°K in presence of O 2 gas were conducted to investigate if it was possible to trap any intermediates involved in SO 3 formation. Pressure change measurements during photolyses were made to see if estimates of SO 3 were possible.…”