Is 0.2M sodium bicarbonate always has pH 8.3?

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Paul Milham

You need to adjust the pH and protect the solution from CO2

Quanhui Ye

Thank you very much for your reply, Dr. Paul. After storage for several months, I find the buffer pH increases. Paul Milham

I know the problem because a pH 8.5 bicarbonate solution is used as an extractant for 'available' soil P (Olsen P) .