Determination of Calcium in Analgesic Tablets Using Atomic Absorption Spectrophotometry

Quigley, Michael N.

doi:10.1021/ed071p800

Cited by 14 publications

(14 citation statements)

References 14 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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“…During the first five weeks of lab, students performed experiments involving pipet calibration, statistics, a Beer's law demonstration, and an analysis of Dristan-a nasal decongestant-components by UV-vis spectroscopy (8). Students also determined Ca 2+ in over-the-counter antacid tablets by AAS (9).…”

Section: T Th He E C Co Ou Ur Rs Se Ementioning

confidence: 99%

Peer Reviewed: The Water Project

Werner¹,

Tobiessen²,

Lou³

2001

Anal. Chem.

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“…It has been pointed out in this Journal (1), as well as in other journals (2), that the use of real-life samples for unknowns in analytical chemistry laboratory courses greatly increases student interest and curiosity. While a number of excellent laboratory exercises for atomic absorption spectroscopy (AAS) have appeared in this Journal over the past decade (3)(4)(5)(6)(7)(8)(9), only a couple of these articles entailed the analysis of real-life samples (4,8,9). We present herein an additional interesting undergraduate AAS laboratory experiment involving analysis of the essential nutrient strontium in a real-life sample, sea water.…”

Section: In the Laboratorymentioning

confidence: 99%

Analysis of the Essential Nutrient Strontium in Marine Aquariums by Atomic Absorption Spectroscopy: An Undergraduate Analytical Chemistry Laboratory Exercise

1997

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Determination of Calcium in Analgesic Tablets Using Atomic Absorption Spectrophotometry

Abstract: Procedure to determine the amount of calcium in calcium carbonate coated analgesic tablets using an atomic absorption spectrophotometer.

Cited by 14 publications

References 14 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

Peer Reviewed: The Water Project

Analysis of the Essential Nutrient Strontium in Marine Aquariums by Atomic Absorption Spectroscopy: An Undergraduate Analytical Chemistry Laboratory Exercise

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