College of Sciences, Shanghai Institute of Technology, Shanghai 201418, China.
Anal Methods. 2021 Feb 28;13(8):996-1002. doi: 10.1039/d0ay01854f. Epub 2021 Feb 3.
In this paper, ultrasensitive electrochemical determination of phosphate in water is achieved by using hydrophilic TiO modified glassy carbon electrodes for the first time. The differential pulse voltammetry (DPV) method is proposed to measure phosphate in water as pulse techniques offer higher sensitivity compared with the conventional cyclic voltammetry (CV) method. Hydrophilic TiO films were obtained upon ultraviolet (UV) illumination after TiO precursor emulsions were coated on the surfaces of glassy carbon electrodes, and used for phosphate determination. Contact angle measurements (around 23.4°) proved the good hydrophilicity of the TiO modified surface upon UV illumination. A detection limit of 0.1 μg L is obtained, and a linear relationship (R = 0.99) between the phosphate concentration (ranging from 0.1 μg L to 1 μg L) and the peak current was observed.
本文首次采用亲水 TiO 修饰玻碳电极实现了水中磷酸盐的超灵敏电化学测定。提出了差分脉冲伏安法（DPV）来测量水中的磷酸盐，因为与传统的循环伏安法（CV）相比，脉冲技术具有更高的灵敏度。在将 TiO 前驱体乳液涂覆在玻碳电极表面后，通过紫外（UV）照射获得亲水 TiO 薄膜，并用于测定磷酸盐。接触角测量（约 23.4°）证明了 UV 照射后 TiO 修饰表面具有良好的亲水性。检测限为 0.1 μg L，并且观察到磷酸盐浓度（范围为 0.1 μg L 至 1 μg L）与峰电流之间的线性关系（R = 0.99）。
