Adsorptive Stripping Voltammetry of Environmental Indicators: Determination of Zinc in Algae

Collado-Sánchez, C.; Hernández‐Brito, J. J.; Pérez‐Peña, J.; Torres-Padrón, M. E.; Gelado-Caballero, M. D.

doi:10.1021/ed082p271

Cited by 6 publications

(7 citation statements)

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“…The methods for zinc content determination in the undergraduate chemistry laboratory include gravimetric, gasometric, volumetric, voltammetric, and spectroscopic analyses (29)(30)(31)(32)(33). In this article, a novel gasometric device is developed using a small-scale assembly made up of a graduated pipet, rubber tubing, a test tube, and detergent as illustrated in Figure 1.…”

Section: Instructional Strategiesmentioning

confidence: 99%

How Many Atomic Layers of Zinc Are in a Galvanized Iron Coating?

Yang

2007

J. Chem. Educ.

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This article describes an experiment using a novel gasometric assembly to determine the thickness and number of atomic layers of zinc coating on galvanized iron substrates. Students solved this problem through three stages. In the first stage, students were encouraged to find a suitable acidic concentration through the guided-inquiry approach. In the second stage, students performed a procedure using a gasometric device associated with data processing. In the third stage, students were provided hints to answer the number of atomic layers of zinc coating through guided problem solving. This experiment is an interesting challenge for undergraduate chemistry students. Student learning is diversified according to various concepts, laws, techniques, and skills. The concepts include vapor pressure, atmospheric pressure, and atomic packing structure. The laws include Dalton's law of partial pressures and ideal gas law. The techniques include the vernier caliper and barometer and assembling a novel gasometric device. Skills require significant figure operation, cone surface-area calculation, data processing, the inquiry-based approach, and problem solving. Students' results showed that a galvanized iron wire and two galvanized nails have 23800–29200, 14600–17900, and 5300–6490 atomic layers of zinc coating, respectively. Statistical analyses of students' and instructor's data indicated that this experiment is suitable for a second-semester general chemistry laboratory.

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Section: Instructional Strategiesmentioning

confidence: 99%

How Many Atomic Layers of Zinc Are in a Galvanized Iron Coating?

Yang

2007

J. Chem. Educ.

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“…Nanomaterials are being explored for a wide range of applications in environmental, biomedical, , and alternative energy technologies, due to their unique physical, chemical, and electronic properties, which emerge from their nanoscale dimensions. In response to the continuous growth of nanotechnology, nanoscience concepts are being incorporated in the undergraduate curricula. − In addition to classes and seminar courses, several laboratory experiments have been developed with the intention of giving undergraduate students the opportunity of having hands-on experiences in the preparation and characterization of nanomaterials, − but only few undergraduate experiments have been developed that incorporate the use of nanomaterials for practical applications. − The aim of this laboratory experiment is to combine the teaching of the fundamentals of metal nanoparticle synthesis, electrochemistry concepts, and the use of metal nanoparticles in electrochemical sensing applications, such as the detection of hydrogen peroxide (H 2 O 2 ).…”

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confidence: 99%

Fabrication of Metal Nanoparticle-Modified Screen Printed Carbon Electrodes for the Evaluation of Hydrogen Peroxide Content in Teeth Whitening Strips

et al. 2015

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A laboratory experiment in which students synthesize Ag, Au, and Pt nanoparticles (NPs) and use them to modify screen printed carbon electrodes for the electroanalysis of the hydrogen peroxide content in commercially available teeth whitening strips is described. This experiment is designed for two 3-h laboratory periods and can be adapted for upper-division undergraduate students in instrumental analysis, materials science, or physical chemistry laboratories. The experiment presented has already been used as a hands-on component in a Functional Nanomaterials Course, which exposed students to the analysis of the electrochemical properties of metal nanoparticles. Moreover, it allows for teaching the basics of nanoparticle synthesis and enables students to learn the fundamentals of electrochemical sensing with nanostructured materials.

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“…The application of potentiometry via the Nernst equation and the OCP measurements illustrates concepts in electrochemistry, analytical chemistry, and environmental chemistry. In this Journal , bioaccumulation experiments have been reported , ; however, these experiments differ from our approach, as we measure biosorption in real time. In addition, our experiment is applicable to a wide range of students.…”

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confidence: 99%