Thesis Defense: Development and Characterization of Solid-Contact Paper-Based and Micro Ion-Selective Electrodes for Environmental Analysis
May 25, 2018 @ 01:30 PM - 03:30 PM
Announcing the Final Examination of Ms. Stephanie M. Armas for the degree of Master of Science
Ion-selective electrodes (ISEs) have extensively been used for food analysis, as medical diagnostic tools, and for some environmental applications. However, ISEs are hindered by the need of a bulky reference electrode and the pre-conditioning step of the sensor, which can often be time consuming and impractical for in field analysis. This work will present and discuss new methodologies to be able to circumvent the pre-conditioning step. Furthermore, this work presents an optimized ready-to-use single strip design, where the bulky glass reference electrode (RE) is no longer needed. The bulky RE was replaced by drop casting a simple two-component mixture consisting of the co-polymer methyl methacrylate-co-decyl methacrylate and the ionic liquid 1-Ethyl-3-methylimidazolium bis (trifluoroethane sulfonyl) amide. This work highlights the benefits of solid-contact ISEs, specifically focusing on two solid-contact platforms: 1) paper-based and 2) a micro-electrode platform. Paper-based sensors were designed to be used as a possible diagnostic tool to be implemented in undeveloped countries to simultaneously monitor low levels of potassium and iodide, as model ions. The micro(µ) ISEs were applied for the in-situ analysis of zinc in citrus plants as a mean to monitor and assess disease progression or therapy.
Committee in Charge: Karin Y. Chumbimuni-Torres (Chair), Santra Swadeshmukul, Melanie Beazley