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. Author manuscript; available in PMC: 2012 Oct 26.
Published in final edited form as: J Am Chem Soc. 2011 Oct 3;133(42):16786–16789. doi: 10.1021/ja207718t

Figure 1.

Figure 1

A schematic illustration of the pre-oxidation technique. A Teflon tube (2 cm × 3 mm ID) is packed with chromic acid to pre-treat the gas flow containing a VOC before passing over the colorimetric sensor array.