An alternative to the use of mercury electrode on the determination of metal ions in voltammetric techniques: Screen-Printed Electrodes.
Tutor / director / evaluatorFlorido Pérez, Antonio
Document typeBachelor thesis
Rights accessOpen Access
In recent years the legal framework concerning the amount of heavy metals allowed in the water discharges is constantly being redefined. Therefore, it is necessary to investigate the development of effective ecological and economical systems in anticipation of future needs. Among these systems, biosorption has proven to be one of the most attractive alternatives since it involves the upgrading of plant waste that otherwise would be incinerated. Mercury was used as an electrode material for a long time due to their wide cathodic range in differents voltammetric techniques. Nevertheless, due to the potentially toxicity of mercury vapors and mercury compounds and wastes, the research of alternative materials which allows to analyze these samples without environmental risks is an area of major concern. A recognized method for the fabrication of sensors and biosensors for the determination of metal ions in industrial, environmental and biomedical applications is based on the screenprinting technology which permits production of numerous highly-reproducible single-use screen-printed electrodes (SPEs). SPEs accessibility, low cost character, miniaturized size, and the possibility of connection to portable instrumentation make these devices very suitable for on-site determination of target analytes. In this project the screen-printed electrodes are used as an alternative to determine metal ions concentrations in wastewaters without using mercury electrodes. This new working methodology has been implemented to determinate the nickel of stock solutions or real samples. The composition of these real samples, provided by a metal electroplating company, was compared with the results by ICP (Parc Científic de Barcelona) method. The obtained results are very similar in both methods.