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Inorganic Carbon. Inorganic Carbon Pools in Aquatic Systems. H 2 0 + CO 2 <-- --> (H 2 CO 3 ) <-- --> HCO 3 -1 + H + <-- --> CO 3 -2 + H + free CO 2 carbonic acid bicarbonate carbonate. Hardness and Alkalinity. Inorganic Carbon and Buffering.
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H20 + CO2 <----> (H2CO3) <----> HCO3-1 + H+ <----> CO3-2 + H+free CO2 carbonic acid bicarbonate carbonate
DIC in Rivers • Decomposition dominates over photosynthesis, so tend to produce CO2 rather than consuming • - Respiration can be so high that CO2 is maintained above equilibrium • Inflowing water high in CO2 from bacterial respiration • High turbulence causes CO2 to be lost quickly, but can see high CO2 in non-turbulent areas and during low flows • Rivers and streams also act to move alkalinity (i.e., HCO3- and CO32-) to lakes or to the ocean
DIC in headwater streams of different parent rock types (Shin et al. 2011)