by Achim Habekost
Original Research
A drastic increase in the consumption of pharmaceuticals has resulted in a high load of pharmaceuticals in wastewater. Many pharmaceuticals are non-biodegradable and are resistant to conventional wastewater treatments. For this reason there is an obvious need to first detect these substances and, second, to detoxify them. Metamizole is a typical representative of an analgesic non-steroidal. In this first part, a rapid, sensitive, and inexpensive detection method with different commercial screen-printed electrodes (SPEs) were used to quantitatively detect metamizole. (Spectro-)Electrochemical methods such as cyclic voltammetry (CV), electrogenerated chemiluminescence (ECL), and amperometry (AM) are discussed in detail and the sensitivities of the electrochemical methods are compared to the sensitivity of conventional gas chromatography-mass spectrometry detection (GC-MSD). The limit of detection (LOD) is 1 μmol/L for GCMS and 5 to 50 μmol/L for electrochemical detection depending on the method used.
World Journal of Chemical Education. 2018, 6(3), 134-144. DOI: 10.12691/wjce-6-3-6
Pub. Date: July 11, 2018
16770 Views2510 Downloads
by Yingchun Liu and Tao Yang
Original Research
This study provides a strategy for controlling the kinetics of formic acid oxidation by potassium bromide. This strategy resolves the nonlinear deviation of the plot of electromotive force against time and ensures that formic acid oxidation follows first-order kinetics over a wide range of reaction temperatures. The methodology reported here should help instructors optimize their teaching efficiency and provides students with valuable insight into the control of chemical kinetics.
World Journal of Chemical Education. 2018, 6(3), 129-133. DOI: 10.12691/wjce-6-3-5
Pub. Date: July 09, 2018
4828 Views1239 Downloads1 Likes
by Johannes Huwer and Johann Seibert
Original Research
Augmented Reality is a good way to enrich and expand not only the environment but also the students' learning. When students come to a chemical laboratory for the first time, it is important to internalize the special rules and regulations. For this reason, we have linked these two components and developed an Augmented Reality Laboratory License. The students should internalize the laboratory and its rules with the help of a rally. The students set off in the laboratory and discover the various symbols and rules with the help of augmented symbols. The standard symbols, such as safety symbols, warning symbols and hazard symbols, were used to provide augmented assistance at the various stations of the rally.
World Journal of Chemical Education. 2018, 6(3), 124-128. DOI: 10.12691/wjce-6-3-4
Pub. Date: June 09, 2018
17989 Views3651 Downloads2 Likes
by Jef Struyf
Opinion Paper
Human hands are the model for the neon electron configuration, organic chemistry, protein function and the genetic code structure. The human hands model is investigated for the periodic table. An original genetic code table is presented for the combined vertebrate mitochondrial and universal nuclear genetic codes. The developmental connection between human (vertebrate) mitochondrial and universal (standard) nuclear genetic codes is investigated. The genetic code structure models the bones and joints structure of a human arm.
World Journal of Chemical Education. 2018, 6(3), 117-123. DOI: 10.12691/wjce-6-3-3
Pub. Date: May 08, 2018
10376 Views3118 Downloads
by M Rut Jiménez-Liso, María Martínez-Chico and Esteban Salmerón-Sánchez
Original Research
Television ads usually use scientific messages to highlight the benefits of the products they advertise. This is the case of a known brand of chewing gum that “helps to increase the oral pH after meals”. From this starting point, we have developed a short sequence of activities (sensopillsfor 1.5h) with a Model-Based Inquiry teaching approach to engage students in scientific practices, and understand disciplinary core ideas and crosscutting concepts in order to promote critical consumers of information about science, as NRC recommend. We use a historical acid/base model (Lemery) to explain and predict oral pH phenomena. The sensopill“chewing gum” has been implemented with hundreds of secondary school students. Learning self-regulation results show that students recognized having learned the difference between dilution and neutralization and the concept of pH and their improvement at some scientific inquiry skills such as hypothesis formulation and data collection.
World Journal of Chemical Education. 2018, 6(3), 113-116. DOI: 10.12691/wjce-6-3-2
Pub. Date: May 04, 2018
10498 Views2245 Downloads1 Likes
by Arijit Das
Original Research
In this approach, formulae based mnemonics by counting lone pair of electrons (localized or delocalized) have been highlighted by innovative and time economic way to enhance interest of students’ who belong to paranoia zone of chemistry for the prediction of aromatic behavior and hybridization state of heterocyclic compounds. In order to ameliorate the field of chemical education, I have taken an enterprise to hub two economic mnemonics including two different formulae. This article encourages students to solve multiple choice type questions (MCQs) at different competitive examinations for a time being in an economic ground for the prediction of aromaticity and hybridization state of heterocyclic compounds containing two or more hetero-atoms. Educators can use these mnemonics in their teaching style in the classroom lectures after discussing conventional methods to make chemistry intriguing because the use of mnemonics in classroom lectures is an essential tool to become a distinguished educator.
World Journal of Chemical Education. 2018, 6(3), 107-112. DOI: 10.12691/wjce-6-3-1
Pub. Date: April 28, 2018
8551 Views2436 Downloads