Development of a USB-powered Mini-potentiostat and the Detection of o-phthalaldehyde Disinfectant

• Main Authors: Wei-Cheng Chen, 陳韋成
• Other Authors: Richie L. C. Chen
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/14847968849319975465

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 102 === An auto ranging mini-potentiostat was constructed by parallel reading architecture and using operational amplifiers (OPA2336P, Texas Instruments) with high input impedance, low input bias current and low input offset voltage. After implementing with a USB-powered DAQ (NI 6008/6009, National Instruments) and LabVIEWTM based graphical user interface, the portable electrochemical device can be used for on-site analysis with a performance comparable to a commercialized laboratory machine (AutolabTM, Eco Chemie). The operating voltage ranges from -1.3 V to 1.1 V and the resolution can reach 100 pA level. The mini-potentiostat was served as the amperometric detector of a conventional flow injection analysis system for measuring o-phthalaldehyde concentration. The current outputs (the peak heights of FIAgram) are reproducible (CV < 5%) and showed good linearity (R2 = 0.9911) in the range of 0.2%-0.5% (w/v), which can be used to evaluate the antiseptic efficiency (minimum effective concentration of o-phthalaldehyde) of the disinfectant used for cleaning endoscope. The sensitivity is 0.18 μA/cm2 mM.