Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent

Copyright © 2019 American Chemical Society and Division of Chemical Education, Inc. A green chemistry experiment is presented for teaching an undergraduate quantitative analysis/analytical chemistry laboratory class through the use of black tea leaf extract for the determination of iron in supplemen...

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Main Authors: Somchai Lapanantnoppakhun, Urai Tengjaroensakul, Pitchaya Mungkornasawakul, Chanida Puangpila, Sila Kittiwachana, Jeeraphithak Saengtempiam, Supaporn Kradtap Hartwell
Format: Journal
Published: 2020
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/68312
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-683122020-04-02T15:30:30Z Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent Somchai Lapanantnoppakhun Urai Tengjaroensakul Pitchaya Mungkornasawakul Chanida Puangpila Sila Kittiwachana Jeeraphithak Saengtempiam Supaporn Kradtap Hartwell Chemistry Social Sciences Copyright © 2019 American Chemical Society and Division of Chemical Education, Inc. A green chemistry experiment is presented for teaching an undergraduate quantitative analysis/analytical chemistry laboratory class through the use of black tea leaf extract for the determination of iron in supplement tablets. Dried tea leaf is a safe, low cost, and widely available source of natural extract that can be used in place of more toxic chemicals (for example, 1,10-phenanthroline) or other uncommon natural reagents that may be hard to obtain outside their native lands. Various student learning outcomes accommodated within this experiment include the principles and hands-on operation of a spectrophotometer, the construction of a calibration graph and obtaining a linear regression equation using Microsoft Excel, the determination of figures of merit (limit of detection, limit of quantitation, and linear working range), and sampling and preparation of supplement tablets with acid digestion. Students were trained in quality control and quality assurance through statistical data analysis for precision (SD) and accuracy (t test, percent recovery, and percent error) for the experiment. They were asked to discuss not only advantages but also limitations of using natural reagents for chemical analysis. Critical thinking and a deep understanding of the experiment were assessed through the students' ability to answer follow-up questions in their report and on the exam. Class management and modification of the experiment to suit a laboratory with limited facilities are discussed. This robust tea-Fe experiment was successfully demonstrated for teaching both large and small laboratory classes at two institutions, one in the U.S. and one in Thailand. 2020-04-02T15:24:48Z 2020-04-02T15:24:48Z 2020-01-14 Journal 19381328 00219584 2-s2.0-85074604723 10.1021/acs.jchemed.9b00530 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074604723&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/68312
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Chemistry
Social Sciences
spellingShingle Chemistry
Social Sciences
Somchai Lapanantnoppakhun
Urai Tengjaroensakul
Pitchaya Mungkornasawakul
Chanida Puangpila
Sila Kittiwachana
Jeeraphithak Saengtempiam
Supaporn Kradtap Hartwell
Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
description Copyright © 2019 American Chemical Society and Division of Chemical Education, Inc. A green chemistry experiment is presented for teaching an undergraduate quantitative analysis/analytical chemistry laboratory class through the use of black tea leaf extract for the determination of iron in supplement tablets. Dried tea leaf is a safe, low cost, and widely available source of natural extract that can be used in place of more toxic chemicals (for example, 1,10-phenanthroline) or other uncommon natural reagents that may be hard to obtain outside their native lands. Various student learning outcomes accommodated within this experiment include the principles and hands-on operation of a spectrophotometer, the construction of a calibration graph and obtaining a linear regression equation using Microsoft Excel, the determination of figures of merit (limit of detection, limit of quantitation, and linear working range), and sampling and preparation of supplement tablets with acid digestion. Students were trained in quality control and quality assurance through statistical data analysis for precision (SD) and accuracy (t test, percent recovery, and percent error) for the experiment. They were asked to discuss not only advantages but also limitations of using natural reagents for chemical analysis. Critical thinking and a deep understanding of the experiment were assessed through the students' ability to answer follow-up questions in their report and on the exam. Class management and modification of the experiment to suit a laboratory with limited facilities are discussed. This robust tea-Fe experiment was successfully demonstrated for teaching both large and small laboratory classes at two institutions, one in the U.S. and one in Thailand.
format Journal
author Somchai Lapanantnoppakhun
Urai Tengjaroensakul
Pitchaya Mungkornasawakul
Chanida Puangpila
Sila Kittiwachana
Jeeraphithak Saengtempiam
Supaporn Kradtap Hartwell
author_facet Somchai Lapanantnoppakhun
Urai Tengjaroensakul
Pitchaya Mungkornasawakul
Chanida Puangpila
Sila Kittiwachana
Jeeraphithak Saengtempiam
Supaporn Kradtap Hartwell
author_sort Somchai Lapanantnoppakhun
title Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
title_short Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
title_full Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
title_fullStr Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
title_full_unstemmed Green Analytical Chemistry Experiment: Quantitative Analysis of Iron in Supplement Tablets with Vis spectrophotometry Using Tea Extract as a Chromogenic Agent
title_sort green analytical chemistry experiment: quantitative analysis of iron in supplement tablets with vis spectrophotometry using tea extract as a chromogenic agent
publishDate 2020
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074604723&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/68312
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