The pH of estuarine waters

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Abstract
The emf measurements for the TRIS buffer in seawater have been used to define buffer solutions that can be used to determine the pH on a free or total proton scale for estuarine waters. The pH is related to the stoichiometric dissociation constant (K*) of TRISH, the concentration of buffer (mTRIS) and salinity (S) by urn:x-wiley:00243590:media:lno19863140839:lno19863140839-math-0001 where a = −9.73 × 10−5 and b = 6.988 × 10−5. The values of pK* were fit to equations of the form urn:x-wiley:00243590:media:lno19863140839:lno19863140839-math-0002 where A, B, and C are functions of salinity and T is the absolute temperature.An electrode system with liquid junction was used to measure these buffers to compare the various pH scales.