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| Titel: |
Atmospheric weathering caused by dry deposition of acidic compounds |
| Auteur: |
Edney, E. O. Cheek, S. F. Corse, E. W. Spence, J. W. Haynie, F. H. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 24 (1989) nr. 5 pagina's 439-457 |
| Jaar: |
1989-07 |
| Inhoud: |
Controlled field studies were conducted at material exposure sites at Research Triangle Park; NC, and Steubenville, OH, between April 25, 1987, and December 28, 1987. Automatic covering/spray systems located at each site were used to expose panels of galvanized steel and paints under the following conditions: (1) dry deposition only; (2) dry plus ambient wet deposition; and (3) dry deposition plus deionized water (Dl). Ambient and Dl-runoff samples were collected on an event basis and underwent detailed chemical analyses. The results from the analyses of the Dl-runoff samples from galvanized steel and oil-based paint panels from each site are presented in this paper. The runoff results show that the dry deposition of acid gases at the sites increased the dissolution rate of galvanized steel corrosion products. At the Ohio site, gases and particulates leading to the formation of SO4= in the Dl-runoff were the major contributing species to the dissolution rate. At the North Carolina site, this preliminary analysis suggests that in addition to SO4=, precursors to runoff NO3- and HCOO- may contribute to the Zn dissolution rate. Although the average SO2 level in Steubenville was 10 times the North Carolina value, the Ohio to North Carolina Zn dissolution rate was only 1.9. This result, in conjunction with the presence of large amounts of dry-deposited Ca in the Ohio runoff samples, suggests that the neutralization of acid gases by dry-deposited basic particulates may have been important at the Ohio site. At the North Carolina site, low levels of anions were found in the paint runoff with H+ as the most abundant cation, a result consistent with the anticipated lack of reactivity toward acid gases due to the absence of alkaline-paint components. The presence of large runoff concentrations of Ca and SO4= at the Ohio site can be explained by increased reactivity of the surface due to dry-deposited basic particles and/or dry deposition of CaSO4. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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