Presentation Title

Influence of temperature, light and pH on the dissolution of transitional metals in Arizona test dust

Start Date

November 2016

End Date

November 2016

Location

HUB 367

Type of Presentation

Oral Talk

Abstract

Transitional metals have been found to be responsible for the major atmospheric oxidation pathways for sulfur oxides. For example, 50% of sulfate production from SO2 in polluted industrial regions in northern Eurasia was due to transitional metal ion catalysis (Alexander et al., 2009; Li et al., 2011b). Therefore, understanding the dissolution of transitional metal ions in cloud droplets is important in order to better understand various chemical pathways in the atmosphere. Here, the effects of temperature, light and pH on concentration of transitional metal ions in Arizona test dust, a standard mineral dust source, in the presence of sulfite were investigated. The concentration of titanium, manganese, iron, and zinc ions were analyzed by ICP-MS. The results show that the dissolution of these ions depends on the different environmental conditions. Chemical processes involved include semiconductor photocatalysis and acid-assisted dissolution. Overall, these studies suggest the dissolution of transitional metals depends on atmospheric conditions - pH, temperature and light, which can further our understanding of how these metal ions catalyze reactions of atmospheric importance.

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Nov 12th, 10:45 AM Nov 12th, 11:00 AM

Influence of temperature, light and pH on the dissolution of transitional metals in Arizona test dust

HUB 367

Transitional metals have been found to be responsible for the major atmospheric oxidation pathways for sulfur oxides. For example, 50% of sulfate production from SO2 in polluted industrial regions in northern Eurasia was due to transitional metal ion catalysis (Alexander et al., 2009; Li et al., 2011b). Therefore, understanding the dissolution of transitional metal ions in cloud droplets is important in order to better understand various chemical pathways in the atmosphere. Here, the effects of temperature, light and pH on concentration of transitional metal ions in Arizona test dust, a standard mineral dust source, in the presence of sulfite were investigated. The concentration of titanium, manganese, iron, and zinc ions were analyzed by ICP-MS. The results show that the dissolution of these ions depends on the different environmental conditions. Chemical processes involved include semiconductor photocatalysis and acid-assisted dissolution. Overall, these studies suggest the dissolution of transitional metals depends on atmospheric conditions - pH, temperature and light, which can further our understanding of how these metal ions catalyze reactions of atmospheric importance.