A pH colorimetric sensor array (CSA) was prepared on a nitrocellulose membrane and used for accurate pH measurement in highly concentrated saline solutions. The CSAs consisted of sensing spots made of a suitable OrMoSil polymer prepared from organo-fluorinated-silane precursors and/or organosilane with tetraethyl orthosilicate hosting an acid–base indicator. Four CSAs were prepared: D, 1F, 2F, and 3F. In D, a nonfluorinated organosilane was present. From 1F to 3F, the concentration of the fluorinated organosilane increased and improved the pH measurement accuracy in highly saline concentrations. No recalibrations were required, and the analytical signal was stable in time. D, 1F, 2F, and 3F were deposited in triplicate, and they were prepared to work in the seawater pH interval (7.50–8.50). The use of fluorinated precursors led to a lower pH prediction error and tailored the interval of the CSA at more basic pH values so that the inflection points of the sigmoidal calibrations of D, 1F, 2F, and 3F moved from 6.97 to 7.98. The overall pH prediction error was 0.10 pH (1F), 0.02 pH (2F), and 0.04 pH units (3F). The CSAs were stable, reversible, reusable, and independent of salinity (S) between 20 and 40. The performances of the CSA were compared with those of a glass electrode, whose pH_NIST values were converted in the pH_SWS scale through a conversion equation. Being unaffected by the typical drawback of the glass electrode, the CSAs can be used directly in seawater real samples, and it validated the proposed conversion equation.

中文翻译：

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使用 pH 比色传感器阵列准确监测高浓度盐水溶液（类似海水）的 pH 值

pH 比色传感器阵列 (CSA) 在硝酸纤维素膜上制备，用于高浓度盐溶液中的精确 pH 测量。 CSA 由合适的OrMoSil聚合物制成的传感点组成，该聚合物由有机氟化硅烷前体和/或有机硅烷制成，并带有酸碱指示剂的原硅酸四乙酯。准备了四个 CSA：D、1F、2F 和 3F。在D中，存在非氟化有机硅烷。从 1F 到 3F，氟化有机硅烷的浓度增加，提高了高盐浓度下的 pH 测量精度。无需重新校准，分析信号及时稳定。 D、1F、2F 和 3F 一式三份沉积，准备在海水 pH 区间（7.50-8.50）下工作。氟化前体的使用导致较低的 pH 预测误差，并在更碱性的 pH 值下调整 CSA 的区间，以便 D、1F、2F 和 3F 的 S 形校准的拐点从 6.97 移动到 7.98。总体 pH 预测误差为 0.10 pH (1F)、0.02 pH (2F) 和 0.04 pH 单位 (3F)。 CSA 稳定、可逆、可重复使用，且与 20 至 40 之间的盐度 ( S ) 无关。将 CSA 的性能与玻璃电极的性能进行比较，玻璃电极的 pH _NIST值通过转换方程转换为 pH _SWS标度。 CSA不受玻璃电极典型缺点的影响，可以直接用于海水实际样品，验证了所提出的转换方程。