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The iodine pentoxide reagent must completely oxidize low concentrations of carbon monoxide at comparatively low temperatures in the presence of about 75% hydrogen and in addition must maintain its activity for a long period. The following procedure, using reagent-grade chemicals, gives a reagent that has an active life of 30 to 40 days.Seventy grams of calcined, crushed insulating brick (Armstrong A-25; -9+14 mesh) are added to a solution containing 100 grams of iodine pentoxide and 4 grams of vanadium pentoxide.