[Microbiology] Medium Buffers, Economical for SRB

[Matt McMahon]

Hello, I'm looking for economical buffers to use at pH 6, 7, and 8 for sulfate reducing bacteria media. 
I'd like to avoid phosphate buffers due to their possible interference with my sulfate assay (does anyone have any experience with this).
 
I am familiar with Good's buffers (MES, MOPS, HEPPS, etc.) but they are very expensive at about $1/g and I am looking for cheaper alternatives as I am making media on the scale of liters per week.
 
Thanks, 
 
Matt McMahon
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Matthew McMahon, Graduate Student
Dept. Chemical Engineering, Queen's University 
Kingston Ontario Canada K7L 3N6 
(613) 533-6000 Ext.  75055 (Lab) 75170 (Graduate Offices)