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carbonate ion

1. n. [Drilling Fluids]

An anion with formula CO3–2. Carbonate chemistry involves a pH-dependent equilibrium between H2O, H+, OH, CO2, HCO3 and CO3–2. At low pH, carbon dioxide [CO2] dominates. As pH rises from acidic toward neutral, HCO3 ions dominate. As pH rises above neutral, CO3–2 ions dominate. If no component is lost from the system (such as CO2 gas evolving), changing pH up and down continually reverses the relative proportion of the carbonate species. Carbonates play several important roles in water mud chemistry.

See: alkalinitybuffered mudcalcium hydroxidecalcium sulfatecarbonate testGarrett Gas Trainhydrolysislignitesodium bicarbonatesodium carbonate

X-Y plot of carbonate ion species.

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