Randy Holmes-Farley
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I cannot find my copy of Chemical Oceanography (Millero) to find the most up to date values, but this reference cites two works showing the second pKa of phosphoric acid in seawater is 6.0 or 6.1:
Phosphate association with Na+, Ca2+ and Mg2+ in seawater
Association constants of orthophosphate ion with Na+, Ca2+, and Mg2+ were measured at μ = 0.68 and 20°C. The results were used to calculate phosphate …
www.sciencedirect.com