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Modified from Lide, D.R., CRC Handbook of Chemistry and Physics, 82nd ed., CRC Press, Boca Raton, FL, 2001; Occupational Safety and Health Administration, Air Contaminant Exposure Standards, 29 CFR 1910.1000, chap. XVII, 6, July 1, 1991; Gates, D., The Chlorine Dioxide Handbook, American Water Works Association, Denver, CO, 1998; EPA, Ozone, in Guidance Manual Alternative Disinfectants and Oxidants, Environmental Protection Agency, 1999, chap. 3; Kim, J., Yousef, A.E., and Dave, S., J. Food Prot., 62, 1071, 1999.

hydrolyze readily but remains in solution as a dissolved gas [13]. ClO2 cannot be compressed or stored commercially as a gas because it decomposes with time and is highly explosive at high concentration (>10% in air) or under pressure. Therefore, ClO2 is generated on-site. The permissible exposure limit (PEL) or time-weighted average (TWA) of ClO2 gas in air is 0.1 ppm, specified by the Occupational Safety and Health Administration [9].

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