PDF(Pubmed)
Abstract：
The progressive increase in nitrate\'s (NO3-) presence in surface and groundwater enhances environmental and human health risks. The aim of this work is the fabrication and characterization of sensitive, real-time, low-cost, and portable amperometric sensors for low NO3- concentration detection in water. Copper (Cu) micro-flowers were electrodeposited on top of carbon screen-printed electrodes (SPCEs) via cyclic voltammetry (with voltage ranging from -1.0 V to 0.0 V at a scan rate of 0.1 V s-1). The obtained sensors exhibited a high catalytic activity toward the electro-reduction in NO3-, with a sensitivity of 44.71 μA/mM. They had a limit of detection of 0.87 µM and a good dynamic linear concentration range from 0.05 to 3 mM. The results were compared to spectrophotometric analysis. In addition, the devices exhibited good stability and a maximum standard deviation (RSD) of 5% after ten measurements; reproducibility, with a maximum RSD of 4%; and repeatability after 10 measurements with the RSD at only 5.63%.
摘要：
地表和地下水中硝酸盐（NO3-）含量的逐渐增加会增加环境和人类健康风险。这项工作的目的是制造和表征敏感，实时,低成本,和便携式安培传感器用于水中低NO3-浓度检测。通过循环伏安法（以0.1Vs-1的扫描速率，电压范围为-1.0V至0.0V），将铜（Cu）微花电沉积在碳丝网印刷电极（SPCE）的顶部。所获得的传感器对NO3-的电还原表现出很高的催化活性，灵敏度为44.71μA/mM。它们的检出限为0.87µM，良好的动态线性浓度范围为0.05至3mM。将结果与分光光度分析进行比较。此外,该装置表现出良好的稳定性和5％的最大标准偏差（RSD）十次测量后，最大RSD为4%；10次测量后的可重复性RSD仅为5.63%。
