Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. VII
Written by Octavian Grigore STOICA, Valer MICLE, Ioana Monica SUR
The current paper presents the method that designs, manufactures and tests antimony based pH sensor used for monitoring of soil pH. In the first stage of this work the method of manufacturing the sensitive antimony elements is presented. These sensitive elements are casted into different forms (conical and cylindrical). These are subjected to a series of analysis in order to determine the chemical composition of the material used 99.73% Sb, 0.27% Ti (EDX), the morphology of the structure (SEM) and the characteristics of the oxide layer (XRD). The second part of this paper explains the method of testing the manufactured antimony sensors in the reference pH solutions. Finally, the sensors are used for measurements and are tested, alternatively, in pairs, with a reference Ag/AgCl sensors found in commerce. The results of these measurements show values approximately identical at both manufactured sensors. The adapted sensor that was obtained shows a relatively fast and stable response to pH changes in aqueous solutions. Its potential has a linear relation with pH solutions and a slope of 50.95 mV/pH.
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