Is there a buffer that can operate in the 3-5 pH range that does not contain organic acids?

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Viktor Y Butnev

You can use Glycine - Hydrochloric Acid (0.1 M Glycine titrated with HCl to necessary pH)

Greg Cote

Have you considered phosphoric acid/sodium phosphate?

Carlos Enrique Perez Heredia

For this pH range the best buffer capacity are:

- malic acid/sodium hydroxide

- citric acid/sodium dihidrogencitrate

- formic acid/sodium formate

- glycolic acid/sodium hydroxide

- sodium fluoride/hidroclhoric acid

- phthalic acid/sodium hydroxide

Attach the chapter book dedicated to buffer preparation, but I recommend use the "BufferMaker" Software. Regards