Britton–Robinson buffer
Britton–Robinson buffer is a "universal" pH buffer used for the pH range from 2 to 12. Universal buffers consist of mixtures of acids of diminishing strength, so that the change in pH is approximately proportional to the amount of alkali added. It consists of a mixture of 0.04 M H3BO3, 0.04 M H3PO4 and 0.04 M CH3COOH that has been titrated to the desired pH with 0.2 M NaOH. Britton and Robinson also proposed a second formulation that gave an essentially linear pH response to added alkali from pH 2.5 to pH 9.2. This mixture consists of 0.0286 M citric acid, 0.0286 M KH2PO4, 0.0286 M H3BO3, 0.0286 M veronal and 0.0286 M HCl titrated with 0.2 M NaOH.
This was invented in 1931 by the English chemist Hubert Thomas Stanley "Kevin" Britton with the New Zealand chemist Robert Anthony Robinson.
