Britton–Robinson buffer
Britton–Robinson buffer (aka BRB aka PEM) is a "universal" pH buffer used for the pH range from 2 to 12. Universal buffers consist of mixtures of acids of diminishing strength (increasing pKa), so that the change in pH is approximately proportional to the amount of alkali added. It consists of a mixture of 0.04 M boric acid, 0.04 M phosphoric acid and 0.04 M acetic acid that has been titrated to the desired pH with 0.2 M sodium hydroxide. 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 (and buffers to pH 12). This mixture consists of 0.0286 M citric acid, 0.0286 M monopotassium phosphate, 0.0286 M boric acid, 0.0286 M veronal and 0.0286 M hydrochloric acid titrated with 0.2 M sodium hydroxide.
This buffer was invented in 1931 by the English chemist Hubert Thomas Stanley "Kevin" Britton (1892–1960) and the New Zealand chemist Robert Anthony Robinson (1904–1979).[1]
See also
References
- ^ "Journal of the Chemical Society (Resumed)". Royal Society of Chemistry. 1931.
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- Britton, H. T. K. and R. A. Robinson. J. Chem. Soc., 1931, 1456–1462.
- Mongay Fernández, C. and V. Cerdá Martin Talanta, 1977, 24(12), 747–748.
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