Oxygen conditions depletion

Denitrification generally increases when the oxygen is depleted in the soil. Prolonged flooding can limit denitrification by restricting nitrification that produces the nitrate for denitrification such conditions may prevail in permanently flooded soils. 

Figure 11.2 Simple two-sink box models for the Mo isotope budget of the oceans in (a) well-oxygenated conditions and (b) oxygen-depleted conditions. The value for the continental source is from [14], Other values are based on those compiled by Arnold et al. [11],...

Despite all these safeguards to extend the service life of the antifreeze, fluid replacement is requited periodically. Typically, fluids are replaced because of irreversible damage caused by one of four conditions contamination, gel formation because of glycol/siUcate reaction, extensive glycol degradation caused by overheating or excessive oxygen exposure, or inhibitor depletion. 

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