Abiotic Degradation: Chlorine dioxide: It has a short half life, and in the presence of sunlight, whether it is in water or as a gaseous molecule, its breakdown products are: chloride and chlorate ions, between pH 4 and 7. Ultimately, oxygen is formed. Biotic Degradation: Chlorate and chlorite ions show a tendency to undergo biodegradation under anaerobic conditions only. There are no reports indicating these ions under go biodegradation under aerobic conditions. Biodegradation for chlorate and chlorite have been observed in anoxic ground water, sediments and some soils. The end products are again the same: chloride and oxygen. ref.