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A focusing critical angle refractometer has been constructed to measure the one‐dimensional refractive index profile immediately adjacent to the glass wall of a liquid container. The instrument displays a graphic image of the entire refractive index profile. It is capable of resolving concentration differences of 10−4 M (10−5 refractive index units) and distances of 0.02 mm.

A One-Dimensional Focusing Critical Angle Refractometer for Mass Transfer Studies