During the second FORMAT (FORMaldehyde as A Tracer of oxidation in the troposphere) campaign in 2003 the airborne multi-axis DOAS instrument (AMAXDOAS) performed scattered-light spectroscopic measurements of SO2 over the city of Mantova and the power plant Porto Tolle, both situated in the Po-valley, Northern Italy. The SO2 vertical columns and emission flux were derived from two days of measur...

[1] The heterogeneous uptake and oxidation of SO2 on particle surfaces representative of mineral dusts found in the atmosphere have been investigated. These particles include metal oxides (e.g., hematite, corundum), calcite, and China loess. FT-IR spectroscopy was used to characterize surface-bound species following exposure to gaseous SO2. It was found that SO2 irreversibly adsorbs as sulfite ...

In order for Fe contained in aeolian dust to act as a micronutrient for oceanic phytoplankton it must be first mobilized or dissolved. We propose that significant Femobilization can occur in mineral dust from East Asia as a result of the incorporation of SO2 from pollutant emissions into the advecting dust plumes and the subsequent acidification of the dust by heterogeneous SO2 oxidation. To te...

The reactions of SO3 with H, O, and OH radicals have been investigated by ab initio calculations. For the SO3 + H reaction (1), the lowest energy pathway involves initial formation of HSO3 and rearrangement to HOSO2, followed by dissociation to OH + SO2. The reaction is fast, with k(1) = 8.4 x 10(9)T(1.22) exp(-13.9 kJ mol(-1)/RT) cm(3) mol(-1) s(-1) (700-2000 K). The SO3 + O --> SO2 + O2 react...

Signatures of sulfur isotope mass-independent fractionation (S-MIF) have been observed in stratospheric sulfate aerosols deposited in polar ice. The S-MIF signatures are thought to be associated with stratospheric photochemistry following stratospheric volcanic eruptions, but the exact mechanism responsible for the production and preservation of these signatures is debated. In order to identify...

Signatures of sulfur isotope mass-independent fractionation (S-MIF) have been observed in stratospheric sulfate aerosols deposited in polar ice. The S-MIF signatures are thought to be associated with stratospheric photochemistry following stratospheric volcanic eruptions, but the exact mechanism responsible for the production and preservation of these signatures is debated. In order to identify...

"A main topic of this study is the non-linearity between sulfur dioxide emissions and sulfate mixing-ratios at surface and in the free troposphere. This aspect needs a more thorough analyses. Non-linearity is caused by low oxidant concentrations (OH and H2O2) in winter and by H2O2 limitations in regions with high SO2 emissions. As oxidation rate is the key process controlling the non-linearity,...

this study presents a review on advanced oxidation processes (aop) for simultaneous removal of no and so2. aop is based on using a strong oxidant such as ozone and h2o2 which is able to generate highly reactive intermediates. the pollutant will be oxidized and removed by these intermediates. in recent years, aop has been considered as an effective and attractive technology in the field of flue ...

Dr. Yusuf G (Debo) Adewuyi is a Professor of Chemical, Biological and Bioengineering Department at North Carolina A&T State University, where his research is in sustainable production of energy & chemical products; synthesis of nanoscale materials for energy and environmental applications; sonochemistry, cavitation and advanced oxidation processes for pollution treatment; liquid-phase chemistry...

Although carbonyl oxides, "Criegee intermediates," have long been implicated in tropospheric oxidation, there have been few direct measurements of their kinetics, and only for the simplest compound in the class, CH2OO. Here, we report production and reaction kinetics of the next larger Criegee intermediate, CH3CHOO. Moreover, we independently probed the two distinct CH3CHOO conformers, syn- and...