Portugaliae
Electrochimica Acta

This study focuses on evaluating the analytical performance and chelation capabilities of SV, using specialized NPM-CPE sensors designed for Ca2+ ion detection. The research context centres on addressing analytical and therapeutic challenges in conditions like gout, where CaC2O4 dissolution plays a critical role. The findings demonstrate that SV exhibits a remarkable ability to chelate Ca2+ ions in a solution, resulting in the formation of stable complexes. A combination of electrochemical techniques, including SWV, CV and EIS, to characterize SV's chelation capacity, and the presence of Ca2+ metals, was employed. Through these electrochemical methods, valuable insights on the efficacy of SV in chelating Ca2+ ions were gained, which offered significant implications for conditions associated with CaC2O4 deposition, such as gout. This study addresses the need to tackle analytical and therapeutic challenges posed by gout and related disorders, and proves a novel approach to understanding and potentially treating these conditions. Detailed results of the research, which include the successful chelation of Ca2+ ions by SV, can be found in the main body of the paper, offering a comprehensive account of the findings. Keywords: chelation; electrochemical methods; gout; SV.

This paper investigated Corchorus olitorius leaves extract efficiency in preventing MS corrosion, when immersed in a KOH solution. This will be the first report on the application of this plant extract in an alkaline medium of any kind, for mitigating metals corrosion. Pc analysis was employed along with PDP and FITR spectroscopy. Pc compounds, such as steroids, saponins, flavonoids, tannins, alkaloids and phenols, were found in the extract, which produced maximum IE(%) of 99.93%. Highest CR of 5.644e+003 mm/year was obtained, while theoretical fittings of various adsorption models for the extract found that it obeyed Langmuir’s isotherm. Kads was 0.9729 g/L, with R2 of 0.9616. 〖∆G〗_ads^° calculated at room temperature was -9.882 kJ/mol. As a result, COLE adsorption onto the MS surface was found to follow physical adsorption mechanism. Keywords: COLE; inhibition; isotherm model; MS; Pcs; PDP.

SAA as novel green inhibitor of MFe corrosion studied by EIS, DFT, PDP and SEM was investigated. It was observed that the increase in SAA various Ct triggered the rise in corrosion IE(%) up to 90.6, 97.6, 98.3 and 98.7%, as shown by EIS, PDP, WL and geometric techniques, respectively. This was due to high Rct during electrochemical processes, which reduced Icorr, and to SAA molecules strong adsorption onto the MFe surface. DFT results revealed short ∆E between SAA and MFe bands, which gave rise to faster inhibitor molecular transfer, stronger adsorption and increased inhibition. Thermodynamic assessment showed that SAA caused an exothermic reaction, creating a stable and spontaneous adsorption reaction. A physical adsorption mechanism was proposed from Langmuir’s isotherm results. Keywords: alkaloids; corrosion; electrochemistry studies; inhibition; quantum chemical calculations; SAA.

1-Methyl-N-((1R,3r,5S)-9-methyl-9-azabicyclo[3.3.1]nonan-3-yl)-1H-indazole-3-carboxamide (C18H24N4O: EGS) is used to prevent nausea and vomiting caused by cancer chemotherapy and radiation therapy. It works by blocking serotonin, a natural substance in the body that causes nausea and vomiting. After expiry, it can be used as additive or CI. IE% of EGS on MS corrosion in a 1 M HCl medium was herein evaluated by WL method. WL measurements showed that corrosion IE% increased with higher Ct of EGS, and its maximum value was obtained with 0.001 M. T affects CR. At high T, corrosion IE% decreased, and CR increased. The mechanistic aspects of corrosion resistance have been studied by PDP and EIS. PDP technique revealed that EGS system functioned as an inhibitor of cathodic type, controlling cathodic reactions. It was noted that, with EGS, icorr decreased and LPR increased. EIS studies revealed that a protective film (blanket effect) was formed on the MS surface, since, with EGS, Rct increased and Cdl decreased. MS surface morphology with EGS was analyzed by SEM. The constituent elements on the MS surface were characterized by EDX. Ra of MS polished, without and with EGS, was characterized by AFM. The results clearly showed that EGS has high IE% for MS corrosion in HCl. Keywords: acidic solutions; AFM; CI; EDX, EIS; EGS; IE(%); MS; PDP; SEM.

Along its 4 decades, the Portuguese Electrochemical Society (Sociedade Portuguesa de Eletroquímica, SPE) has been fostering the Electrochemical Sciences through a diversity of perspectives and pathways, which are illustrated in this talk, within the celebrations of the 40th anniversary of this Society. They include: (i) the publication of Portugaliae Electrochimica Acta (PEA), the only journal on original research in chemical sciences currently being published in Portugal; (ii) the organization of conferences of the SPE and of the Iberic Meetings of Electrochemistry (IME), the latter jointly with the Specialized Group of Electrochemistry of the Royal Spanish Chemical Society (Grupo Especializado de Electroquímica de la Real Sociedad Española de Química, GEE-RSEQ), apart from sponsoring other international conferences; (iii) the award of prizes for senior scientists and for young researchers; (iv) the coinage of celebratory medals; (v) the surveys of the Research on Electrochemistry in Portugal; (vi) the establishment of a Library; (vii) the cooperation with other scientific societies; (viii) other initiatives; and (ix) prospects. All the above-mentioned topics should contribute to the assignment of the role of the SPE within the national panorama of science and education in Portugal. Keywords: IME; PEA; RSEQ; GEE-RSEQ; SPE; SPQ; meetings; medals; prizes; research survey.