Radioactive dating: A method for geochronology

Rowe, M. W.

doi:10.1021/ed062p580

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Sherren presented compelling arguments for using real-life samples for unknowns in the chemistry curriculum since such samples inherently contain “impurities” that must be taken into consideration as professional chemists would have to do . Determination of metals in real-world samples using spectrometric methods have been published in this Journal . − Although the connections between chemistry and geology have been explored, − publications on the analysis of rock/mineral samples have been rare . The analysis of limonite, a complex and common Earth material, presented a valuable teaching opportunity to engage students at the first-year and senior levels.…”

Section: Pedagogical Rationalementioning

confidence: 99%

Quantitative Determination of Iron in Limonite Using Spectroscopic Methods with Senior and General Chemistry Students: Geology-Inspired Chemistry Lab Explorations

2016

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Limonite is the field term for a mixed assemblage of ferric oxyhydroxides, often containing nonferric silicate impurities. It is abundant on Earth's surface, possesses variable iron content, and is easily recognized by distinctive yellow and ochre hues. Limonite is a unique centerpiece for undergraduate chemistry laboratories because each sample represents a true unknown to faculty and students alike, and because limonite does not digest readily with common methods. Senior students were guided through a primary literature review to assess and establish an appropriate digestion method. Students then constructed the procedure for determining the iron content in limonite using atomic absorption spectroscopy. A final report, produced in the style of this Journal, completed the start-to-finish process used by scientists, helping students learn how novel problems are solved in the laboratory. General chemistry students were provided with limonite extracts and used UV−vis spectroscopy to determine their iron contents, gaining proficiency in wet-lab, data collection, and analysis skills. Lab reports included an interdisciplinary discussion/interpretation of results from chemistry and geologic perspectives. The method used by students for digestion and iron extraction was validated using goethite and iron(III) oxide as standards (<3% error). The two spectrometric methods provided comparable results for the iron content in limonite. Despite challenging all students, these experiments were rated favorably in written evaluations, and students self-rated their learning gains as very high. Limonite experiments promote curiosity, discussion, and departure from laboratory exercises with predetermined results. Students become vested in analyzing a geologically important material that is inherently complex and heterogeneous.

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Section: Pedagogical Rationalementioning

confidence: 99%

Quantitative Determination of Iron in Limonite Using Spectroscopic Methods with Senior and General Chemistry Students: Geology-Inspired Chemistry Lab Explorations

2016

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Studies on Simulated Ageing of Paper by Photochemical Degradation

2005

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The study of the ageing of two paper types was performed on monitoring it during a simulated process by means of the measure of the photocatalytic degradation of the paper cellulose. Such evaluation was possible due to the combined responses of a photosensor based on titanium dioxide in suspension, of an enzymatic biosensor based on superoxide dismutase (SOD), of a specific conductivity sensor and of an enzymatic biosensor based on glucose oxidase.

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Theoretical study on the ability of bicyclic cryptands to separate alkali-metal isotopes by ion exchange

Okumura

Ishikawa

2019

New J. Chem.

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Radioactive dating: A method for geochronology

Abstract: The discovery of radioactivity, radioactive dating, and various dating methods.

Cited by 3 publications

References 4 publications

Quantitative Determination of Iron in Limonite Using Spectroscopic Methods with Senior and General Chemistry Students: Geology-Inspired Chemistry Lab Explorations

Quantitative Determination of Iron in Limonite Using Spectroscopic Methods with Senior and General Chemistry Students: Geology-Inspired Chemistry Lab Explorations

Studies on Simulated Ageing of Paper by Photochemical Degradation

Theoretical study on the ability of bicyclic cryptands to separate alkali-metal isotopes by ion exchange

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