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Abstract A pH colorimetric sensor was prepared and characterized by combining two acid-base indicators, Tetrabromophenol blue (TBB) and Phenol Red (PR) with molar ratios ranging from 0 to 0.47. Indicators… Click to show full abstract
Abstract A pH colorimetric sensor was prepared and characterized by combining two acid-base indicators, Tetrabromophenol blue (TBB) and Phenol Red (PR) with molar ratios ranging from 0 to 0.47. Indicators were embedded in Organically Modified Silicate (OrMoSil) spots supported in Polyvinylidene fluoride (PVDF) together with a suitable cationic surfactant. The deposition procedure was very repeatable allowing a single calibration for all membranes built in the same preparation lot. The signal was based on the Hue profile (H) vs. pH. The CIE-xy color space contains an achromatic point that is the key point of the colorimetric sensor behavior as it causes the inversion of the slope of the H calibration curve at a specific inversion point. For this reason, the identification of the effective conditions of the improvement of the PR analytical performances are not trivial, 0.186
Journal Title: Microchemical Journal
Year Published: 2020
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