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Ion chromatographs with conductivity detection of extracted films of (A) syringaldehyde, (B) vanillin, and (C) 4-hydroxybenzaldehyde (black) before and (red) after 3 h exposure to 207 ppmv O3(g) at 74% RH. Films extracted in isopropanol were dried and reconstituted in water before injection. Peaks labeled in each panel are correspondingly listed in Table 2.
