@article{del Valle_Díaz_Pardo_Gacitua_2020, title={ELECTRODE MODIFIED WITH A POLYMER OF ANILINE AND 3-HEXYLTHIOPHENE TO BE ASSAYED IN THE SELECTIVE DETERMINATION OF NITRATE}, volume={65}, url={https://www.jcchems.com/index.php/JCCHEMS/article/view/1554}, abstractNote={<p>In this work, platinum electrodes are modified with poly[4-(3-hexyl-2-thiophene)-aniline], PTANIr2, and characterized by cyclic voltammetry. In the presence of nitrate in the electrolytic medium, an oxidation signal at 0.6 V <em>vs</em>. SCE is recorded, so the response of this modified electrode, Pt|PTANIr2, is evaluated to determine its relationship with the concentration of the anion. Thus, it is verified that the best response is achieved by chrono-amperometry, obtaining a directly proportional relationship between the charge and the concentration, in an interval between 5 and 100 mg L<sup>-1</sup> of the anion, with r<sup>2</sup> = 0.996. Furthermore, it is found that the response of Pt|PTANIr2 is quite selective for nitrate, since there is no response for anions such as HPO<sub>4</sub><sup>-</sup>, PO<sub>4</sub><sup>2-</sup>, ClO<sub>4</sub><sup>-</sup>, F<sup>-</sup>, Cl<sup>-</sup>, Br<sup>-</sup>, I<sup>-</sup>, and NO<sub>2</sub><sup>-</sup>, thereby contributing significantly to solving the main problem of devices of this type proposed so far. Finally, the surfaces were characterized by atomic force microscopy, showing a strong anion-polymer layer interaction. Thus, this material can be proposed to be tested as a columbimetric nitrate sensor, highlighting the possibility of varying the area of the electrode and/or the thickness of the deposited polymeric layer and with it, the sensitivity of the device.</p> <p>&nbsp;</p> <p><img src="/public/site/images/schq/1554.jpg"></p&gt;}, number={4}, journal={Journal of the Chilean Chemical Society}, author={del Valle, María Angélica and Díaz, Fernando and Pardo, María Angelica and Gacitua, Manuel}, year={2020}, month={Nov.}, pages={5023-5026} }