Buffers of Low Ionic Strength for Spectrophotometric pK Determinations

Abstract

Buffers of low and constant ionic strength (I = 0.01), covering the pH range 2.2 to 11.6 at 20°C, are described. Their near-transparency in the ultraviolet region makes these buffers suitable for spectrophotometric pK determinations, and only small, constant corrections are needed to convert the experimental values to thermodynamic quantities.