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2003
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January
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In the Laboratory
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Micelle-Mediated Extraction of Heavy Metals from Environmental Samples: An Environmental Green Chemistry Laboratory Experiment
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Dimosthenis L. Giokas, Evangelos K. Paleologos, and Miltiades I. Karayannis
Department of Chemistry, Laboratory of Analytical Chemistry, University of Ioannina, Ioannina 45110, Greece
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January 2003
Vol. 80 No. 1
p. 61
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| Abstract |
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A new laboratory experiment in which students extract and analyze several metallic contaminants from environmental samples is presented. The experimental procedure employs extraction of the target analytes by using an environmentally-benign preconcentrating technique prior to the identifications, which are carried out with a flame atomic absorption spectrometer. The extraction procedure employs complexation of the metallic species via a chelating agent, entrapment and solubilization via micelle formation, and isolation via phase separation when the solution temperature is raised. The overall process involves preparation of standard solutions and construction of a calibration curve, analysis of water samples, and evaluation of the matrix effect, through the analysis of several spiked samples. As a part of the evaluation protocol, a reference sample is also analyzed. Students become familiar with basic principles of analytical, environmental, and green chemistry through a "real world" application.
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| Supplement |
Notes for the instructor are available.
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 Contents |
JCE2003p0061W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Giokas, Dimosthenis L.; Paleologos, Evangelos K.; Karayannis, Miltiades I. J. Chem. Educ. 2003 80 61.
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Keywords |
Analytical Chemistry; Atomic Spectroscopy; Environmental Chemistry; Laboratory Instruction; Metals; Micelles; Problem-Based Learning
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History |
Created:
Last Updated: |
December 5, 2002
February 28, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2003
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January
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61
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