Physiologists measure buffering capacity of a cell or fluid in terms of mM / pH (or mEq / pH). However, oceanographers measure buffering capacity of seawater in mmol / kg seawater (total alkalinity). How do you convert between these values?

Let's say the buffering capacity of an animal's coelomic fluid is 4 mmol / kg. How does one convert this to mM / pH?

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