Faculty of Applied Sciences, University of the West of England, Bristol, Frenchay Campus, Coldharbour Lane, Bristol BS16 1QY, UK.
Sensors (Basel). 2022 Jun 19;22(12):4631. doi: 10.3390/s22124631.
The voltammetric behaviour of Rhodamine B was studied at a screen-printed carbon electrode (SPCE), by cyclic and differential pulse voltammetry. Cyclic voltammograms exhibited two reduction peaks (designated R1 and R2) generated from the reduction of the parent compound through, first, one electron reduction (R1) to give a radical species, and then a further one-electron, one-proton reduction to give a neutral molecule (R2). On the reverse positive-going scan, two oxidation peaks were observed. The first, O1, resulted from the oxidation of the species generated at R2, and the second, O2, through the one-electron oxidation of the amine group. The nature of the redox reactions was further investigated by observing the effect of scan rate and pH on the voltammetric behaviour. The developed SPCE method was evaluated by carrying out Rhodamine B determinations on a spiked and unspiked environmental water sample. A mean recovery of 94.3% with an associated coefficient of variation of 2.9% was obtained. The performance characteristics indicated that reliable data may be obtained for Rhodamine B measurements in environmental water samples using this approach.
在丝网印刷碳电极（SPCE）上，通过循环伏安法和差分脉冲伏安法研究了罗丹明 B 的伏安行为。循环伏安图显示了两个还原峰（标记为 R1 和 R2），它们是通过母体化合物的第一个电子还原（R1）生成自由基物种，然后再进行一个进一步的单电子、一质子还原生成中性分子（R2）而产生的。在正向正扫描时，观察到两个氧化峰。第一个峰 O1 是由 R2 生成的物种的氧化产生的，第二个峰 O2 是通过胺基的单电子氧化产生的。通过观察扫描速率和 pH 值对伏安行为的影响，进一步研究了氧化还原反应的性质。通过对加标和未加标环境水样进行罗丹明 B 测定，对开发的 SPCE 方法进行了评估。得到了 94.3%的平均回收率，相对标准偏差为 2.9%。性能特征表明，使用这种方法可以可靠地获得环境水样中罗丹明 B 测量的数据。
