Orbital: The Electronic Journal of Chemistry

Editorial

Fri, 30 May 2025 00:00:00 +0000

Electroanalytical determination of two ACCase-inhibing herbicides in soybean products. A theoretical insight

Thu, 29 May 2025 19:21:59 +0000

This study evaluates the possibility of electroanalytical detection of clethodim and fenoxaprop-p-ethyl in soybean crops and products. The electrochemical analysis may be performed at both the cathode and the anode, given the presence of donor and acceptor functional groups. Two mathematical models, each for the positive or negative polarity of the working electrode, were developed and analyzed using linear stability theory and bifurcation analysis. Either way, the electroanalytical behavior is effective and sufficient to quantify the nanomolar concentrations of both pesticides. However, considering the moderately acidic environment of the soybean plant and its products, the cathodic process is preferable.

Strontium Titanate (SrTiO3) for Adsorption of Cd(II) Ions and Photodegradation of Methylene Blue Dye in Aqueous Solutions

Fri, 30 May 2025 12:58:12 +0000

Strontium titanate (SrTiO₃ – STO) is a metal oxide with a perovskite structure that has attracted scientific interest due to its various applications. The present study aims to synthesize STO and evaluate its potential for adsorption of Cd(II) ions and photodegradation of methylene blue. The STO samples were synthesized using the polymer precursor method and microwave-assisted hydrothermal method. X-ray diffraction analysis confirmed the formation of STO crystalline phase, and scanning electron microscopy revealed differences morphology to distinct synthesis method used. STOMW sample was able to remove 94.7% of Cd(II) ions in solution, while STOPP sample demonstrated good photocatalytic activity, with 80% dye degradation. The results indicate that STO is a promising material for the removal of both inorganic and organic contaminants from aqueous waste.

Teacher Education for High School Chemistry Teachers in Brazil: An Analysis of Manuscripts

Mayker Miranda — Thu, 29 May 2025 00:00:00 +0000

Chemistry is a science that causes human, political and social impacts. Contemporaneous didactic-pedagogical development programs have focused on reflexive teachers who participate in appropriation of knowledge with their students. These programs are based on a close relation between knowledge and learning. The teaching profession is complex and goes beyond knowing and teaching. The search for balance among required competencies in teaching degree programs is fundamental to develop teachers’ profiles. To reach balance, teachers’ early Education must be guided through the articulation path between specific knowledge and pedagogical knowledge. In Higher Education, teaching degrees in Chemistry should account for several aspects, such as the content to be taught, curriculum, pedagogy related to the course, scientific knowledge and other specificities about teaching and teaching of the chemical science. Keeping in mind the educational process of Chemistry teachers in Brazil, this study aimed at understanding – through scientific studies in the field of chemical Education – the development of Chemistry teachers’ practices in their lessons. The investigation aimed at discussing what influences specific and pedagogical development of Chemistry teachers and what challenges their work in Brazil nowadays. Twenty-five papers published in Brazilian journals were selected to determine how pedagogical knowledge is inserted into teacher Education programs that focus on undergraduate students in Chemistry. This paper also describes methodological strategies used by teachers to carry out their tasks. The methodology of the study had a qualitative-exploratory nature. Results reinsure that teachers, mainly Chemistry teachers, need to reflect upon methodologies they use, re-invent their practices, look for theoretical references and update their knowledge of Chemistry teaching.

Development and Evaluation of an Electromechanical Flowmeter for Volumetric Flow Measurement: Applications in Wastewater-based Epidemiology and Microplastic Monitoring in Aquatic Environments

Wed, 28 May 2025 00:00:00 +0000

Flow measurement is essential in environmental studies, enabling the calculation of contaminant loads in water and wastewater flows and supporting impact assessments. In wastewater-based epidemiology (WBE), for example, measuring influent flow at wastewater treatment plants (WWTPs) is critical for estimating population exposure to drugs and viruses. Mechanical flow meters are also valuable for microplastic studies in aquatic environments, as they measure water volumes passing through plankton nets during sampling. To address the need for reliable and cost-effective flow data, in this study a low-cost electromechanical flowmeter was developed. The device features a compact electronic system based on an Arduino Pro Mini board, sensors, an OLED display, and other components, allowing remote monitoring of rotations, time, and battery autonomy. The structure comprises an acrylic tube, 3D-printed impeller, caps for waterproofing, and supports for electronic circuits. The device demonstrated accurate measurements, was waterproof, compact, and adaptable to various applications. It offers a cost-effective solution, approximately 50 times cheaper than market alternatives, paving the way for innovations in WBE and microplastic research.