3 things to measure in Ocean Acidification.
dissolved Ca
dissolved CO3
Particulate CaCO3
Ca can usually assumed to be constant with salinity, and is computed using a complicated set of equations.
CO3 cannot be measured directly. First you must measure Alkalinity and dissloved inorganic carbon, and/or pH. The you can calculate CO3
Particulate CaCO3 is not commnly done for water samples because the samples are too small. More common for sediments. You take the same, acidify it and then capture the CO2 gas
**This information was provided by Dr Thomas Helmuth. Dalhousie University.
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