I have TBS pH 7.4 buffer that I am exchanging all the water out for $\ce{D2O}$. How do I find out what the pD is after all the water is gone? I understand that pH meters don't work for deuterium, and it seems like deuterium also changes the spectral properties of the chromophores in pH paper (or in this case pD paper)
Also, if I want to best mimic the alkaline conditions in $\ce{D2O}$ as $\ce{H2O}$, should pD final = pH initial?