Department of Chemical Sciences, University of Padua, Via Marzolo 1, 35131 Padua, Italy.
Sensors (Basel). 2020 Oct 23;20(21):6036. doi: 10.3390/s20216036.
A pH colorimetric sensor array was prepared and characterized by combining tetrabromophenol blue (TBB) and bromothymol blue (BB) embedded in organically modified silicate () spots polyvinylidene fluoride (PVDF)-supported. The signal was based on the profile (). The individual calibrations of TBB and BB showed precisions with minimum values of 0.012 pH units at pH = 2.196 for TBB and 0.018 at pH = 6.692 for BB. The overall precision of 10 spots of the mixture TBB/BB increased in the pH range of 1.000-8.000 from a minimum value of pH precision of 0.009 at pH = 2.196 to 0.012 at pH = 6.692, with the worst value of 0.279 pH units at pH = 4.101. The possibility to produce an array with much more than 10 spots allows for improving precision. The analytical performance was compared to those of other color spaces such as RGB, Lab, and XYZ. was the best one, with prediction error in the range of 0.016 to 0.021 pH units, at least three times lower than the second-best (x coordinate), with 0.064 pH units. These results were also confirmed by the calculation of the main experimental contributions to the pH prediction error, demonstrating the consistency of the proposed calculation approach.
一种 pH 比色传感器阵列通过结合四溴苯酚蓝（TBB）和溴百里酚蓝（BB）嵌入在有机改性硅酸盐（OS）斑点聚偏二氟乙烯（PVDF）-支持物中制备和表征。信号基于（）轮廓。TBB 和 BB 的单独校准显示出最小精度值，在 pH = 2.196 时 TBB 为 0.012 pH 单位，在 pH = 6.692 时 BB 为 0.018 pH 单位。TBB/BB 混合物的 10 个斑点的整体精度在 1.000-8.000 pH 范围内增加，最小 pH 精度值从 pH = 2.196 时的 0.009 增加到 pH = 6.692 时的 0.012，最差值为 0.279 pH 单位在 pH = 4.101 时。生产超过 10 个斑点的阵列的可能性允许提高精度。分析性能与其他颜色空间（如 RGB、Lab 和 XYZ）进行了比较。（）是最好的，预测误差在 0.016 到 0.021 pH 单位之间，至少低三个数量级，第二个最好的是（x 坐标），为 0.064 pH 单位。通过计算 pH 预测误差的主要实验贡献，也证实了所提出的计算方法的一致性。
