Suggest a buffer to increase PH that will not cause precipitation in high salt containing media like sea water, zobell marine broth etc.
Every buffer has a optimal pH range and you don't mention the pH.
You write seawater which is typically above 8. In such a case you could consider boric acid. It is often convenient to use the salt borax.
https://en.wikipedia.org/wiki/Borax
A number of organic buffers are available in this pH range. I would not expect them to precipitate in high salt conditions.
http://www.sigmaaldrich.com/life-science/core-bioreagents/biological-buffers/learning-center/buffer-reference-center.html
Try buffers like MOPS (pKa=7.31), HEPES (pKa=7.66), TRIS (pKa=8.06), Ethanolamine (pKa=9.5) or CAPS (pKa=10.51) depending on the final pH you want to have in your medium. Depending on the acid production by bacteria in your media decide on the strength of the buffer. If the acid production is in millimolar range, go for 50 mM buffer strength to start with.
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