Quote Originally Posted by Alan Johnson View Post
However this buffer did not stop the pH drop problem, initial pH of 9.0 fell to 8.8 after 7 days,7.8@14 days, 7.7 @23 days.
Some time ago I was research some pH-stability issues in ascorbate devs. 1st replace ascorbic acid to sodium ascorbate or ascorbic acid with valid amount of sodium carbonate for produce sodium ascorbate. 2nd - make your buffer solution. For pH=9 try ~10g/l of Borax, or borax+sodium carbonate