Contactless sensors for chemical analysis, based on inexpensive and widely available electronic components, are a promising alternative to existing routine laboratory methods. We have proposed a novel type of a contactless sensor, composed of three simple components: an alternate current generator, an inductance coil, and a receiver. The sample, placed into the coil as a core of the inductor, modifies the current passing through the coil. Previously, we have demonstrated that this contactless sensor may have numerous applications for chemical analysis. In this work, we have explored the performance of the coil-based measuring platform further and performed the first systematic study of the response of inductance coil sensor to metal cations in aqueous solutions. Sixteen metal cations with different charge and radii were studied. Linear response ranges, sensitivity values and the comparison between univariate and multivariate regression modeling are presented. The largest linear response range was observed for transition metal cations Ni2+, Cu2+, Pb2+ and Nd3+ (10-3 – 10-1 M), the narrowest – for Li+ and Gd3+ (10-2 – 3.2x10-1 M) with R2 values larger than 0.94. The dependence of the response on the radius and the charge of the cation are discussed. The analytical characteristics of the device show its potential in contactless and low-cost chemical analysis and set the ground for the future research. © 2024 Elsevier Ltd
Original languageEnglish
Article number114716
JournalMeasurement
Volume232
DOIs
StatePublished - 1 Jun 2024

    Research areas

  • Conductometry, Contactless measurements, Inductance coil, Metal cations, Inductance, Positive ions, Regression analysis, Cationics, Contact less, Contactless measurement, Contactless sensors, High frequency HF, Inductance coils, Linear response range, Metal cation, Systematic study, Transition metals

ID: 125644118