微流控
材料科学
电极
水溶液中的金属离子
电化学
微型多孔材料
丝网印刷
纳米技术
校准曲线
分析化学(期刊)
金属
检出限
光电子学
复合材料
色谱法
化学
冶金
物理化学
作者
Ying Hong,Meiyan Wu,Guangwei Chen,Ziyang Dai,Yizhou Zhang,Guosong Chen,Xiaochen Dong
标识
DOI:10.1021/acsami.6b10464
摘要
Fabricating portable devices for the determination of heavy metal ions is an ongoing challenge. Here, a 3D printing approach was adopted to fabricate a microfluidic electrochemical sensor with the desired shape in which the model for velocity profiles in microfluidic cells was built and optimized by the finite element method (FEM). The electrode in the microfluidic cell was a flexible screen-printed electrode (SPE) modified with porous Mn2O3 derived from manganese containing metal-organic framework (Mn-MOF). The microfluidic device presented superior electrochemical detection properties toward heavy metal ions. The calibration curves at the modified SPE for Cd(II) and Pb(II) covered two linear ranges varying from 0.5 to 8 and 10 to 100 μg L-1, respectively. The limits of detection were estimated to be 0.5 μg L-1 for Cd(II) and 0.2 μg L-1 for Pb(II), which were accordingly about 6 and 50 times lower than the guideline values proposed by the World Health Organization. Furthermore, the microfluidic device was connected to iPad via a USB to enable real-time household applications. Additionally, the sensing system exhibited a better stability and reproducibility compared with traditional detecting system which offered a promising prospect for the detection of heavy metal ions especially in household and resource-limited occasions.
科研通智能强力驱动
Strongly Powered by AbleSci AI