Electrochemical Determination of Chemical Oxygen Demand (COD) in Surface Water Using a Microfabricated Boron-Doped Diamond (BDD) Electrode by Chronoamperometry
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2023-01-19 |
| Journal | Analytical Letters |
| Authors | Jian Lin, Jiawen Yin, Wanlei Gao, Qinghui Jin |
| Institutions | State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology |
| Citations | 6 |
Abstract
Section titled āAbstractāChemical oxygen demand (COD) is an important indicator of the degree of organic pollution in water. However, the development of integrated and batch COD electrochemical sensors has always been challenging. In this study, a three-electrode integrated electrochemical sensor for the measurement of COD in surface water was evaluated. Using microfabrication with a microelectromechanical system (MEMS), the sensor was mass-produced and integrated with boron-doped diamond (BDD), Pt, and Ag/AgCl electrodes on the chip. The determination of glucose in optimal conditions provided a linear range from 5 to 200 mg Lā1, a detection limit of 3.899 mg Lā1, and satisfactory linearity (R2) of 0.998. As the sensor was fabricated by MEMS technology, good reproducibility was experimentally verified with relative standard deviations less than 4%, which suggests mass production of the sensor. The sensor was calibrated to be relatively stable in the presence of Clā and NO2ā. A low-cost, miniature (6 mm2), and stable COD sensor was designed using microfabrication technology that may be mass-produced to build a water quality detection network in the Internet of Things era.