Abstract
The long‐term accumulation of chloride and other ions on indoor zinc and aluminum surfaces in 15 U.S. cities has been measured. For most ionic contaminants, the accumulation on zinc and aluminum surfaces is similar, suggesting that particulate deposition is the most likely mode of accumulation. Chloride accumulation on aluminum occurs by particulate deposition, but on zinc surfaces, attack by reactive chlorine containing gases also contributes to accumulation. In New York City and Philadelphia, chloride accumulation is very rapid on all zinc surfaces but not on aluminum surfaces. Volatilization of chloride, probably as or , seems to contribute to the low chloride concentrations observed on aluminum surfaces in these cities. In Wichita and Houston, deposition of coarse chloride containing particulates produces rapid accumulation of chloride on horizontal zinc and aluminum surfaces while chloride accumulation on vertical surfaces is slow.
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