Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong, 519082, People's Republic of China.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, People's Republic of China.
Mikrochim Acta. 2022 Oct 10;189(11):412. doi: 10.1007/s00604-022-05485-1.
New insights are proposed into enhancing detection of uranyl ions (UO) by electropolymerization brilliant cresyl blue-modified glassy carbon electrode (PBCB/GCE). The mercury-free PBCB/GCE sensor was applied to determine UO in water samples by differential pulse adsorptive stripping voltammetry (DPAdSV). The unique combination of the PBCB/GCE and DPAdSV significantly improves sensitivity due to the polymer of high electroactive area and fast electron transfer rate. The DPAdSV current using a 3 mm diameter PBCB/GCE was proportional to the UO concentration in the range 2.0-90.0 μg·L (- 0.113 V vs. SCE) with a detection limit of 0.650 μg·L, RSD = 3.1% (n = 10), and 4.5% reproducibility. In addition, the sensitivity for UO determination was further improved at using an 1 mm diameter PBCB/GCE, which enhances the efficiency of UO deposition due to its higher current density. The 1 mm diameter PBCB/GCE based on DPAdSV technique could be used to determine uranyl ions in the concentration range 0.20-2.0 μg·L (- 0.113 V vs. SCE) with a detection limit of 0.067 μg·L, RSD = 5.7 % (n = 10) and 5.4% reproducibility. Hence, the PBCB/GCE is a suitable candidate to substitute the mercury electrode. Graphical abstract.
新的见解被提出，以通过电聚合亮甲酚蓝修饰的玻碳电极（PBCB/GCE）增强铀酰离子（UO）的检测。无汞的 PBCB/GCE 传感器通过差分脉冲吸附溶出伏安法（DPAdSV）用于测定水样中的 UO。由于聚合物具有高的电活性面积和快速的电子转移速率，PBCB/GCE 和 DPAdSV 的独特组合显着提高了灵敏度。使用 3mm 直径的 PBCB/GCE 的 DPAdSV 电流与 UO 浓度在 2.0-90.0μg·L（-0.113V 与 SCE 相比）范围内呈正比，检测限为 0.650μg·L，RSD=3.1%（n=10），重现性为 4.5%。此外，使用 1mm 直径的 PBCB/GCE 进一步提高了 UO 测定的灵敏度，这是由于其更高的电流密度增强了 UO 的沉积效率。基于 DPAdSV 技术的 1mm 直径 PBCB/GCE 可用于测定浓度范围为 0.20-2.0μg·L（-0.113V 与 SCE 相比）的铀酰离子，检测限为 0.067μg·L，RSD=5.7%（n=10），重现性为 5.4%。因此，PBCB/GCE 是替代汞电极的合适候选物。
