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2005
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In the Laboratory
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Making and Using a Sensing Polymeric Material for Cu2+: An Introduction to Polymers and Chemical Sensing
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Jean R. Paddock, Anne T. Maghasi, William R. Heineman, and Carl J. Seliskar
Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221
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September 2005
Vol. 82 No. 9
p. 1370
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| Abstract |
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In this experiment, students will be introduced to concepts of polymer chemistry, chemical sensors, metal chelates, spectroscopy, and quantitative analytical methods. A polymer network is generated by students and consists of crosslinked poly(vinyl alcohol) blended with the polyelectrolyte poly(acrylic acid), which is then doped with the spectroscopically-active chelating agent PAN, 1-(2-pyridylazo)-2-napthol. All components of this hydrogel serve as an ion-exchange medium trapping cations that, when exposed to solutions of 2+ metals, can act as a material in a chemical sensor. The doped polymer network is exposed to various concentrations of Cu2+ for 1 hour. The formation of a PAN–Cu complex (λmax = 550 nm) is monitored spectroscopically. A calibration curve for the complex is generated and can be used to identify Cu2+ samples of unknown concentration.
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| Supplement |
Instructions for the students and notes for the instructor are available.
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 Contents |
JCE2005p1370W.doc (Microsoft Word)
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| More Information |
Citation |
Paddock, Jean R.; Maghasi, Anne T.; Heineman, William R.; Seliskar, Carl J. J. Chem. Educ. 2005 82 1370.
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Keywords |
Analytical Chemistry; Copper; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Ion Exchange; Laboratory Instruction; Polymer Chemistry; Polymerization; Quantitative Analysis; UV-Vis Spectroscopy
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History |
Created:
Last Updated: |
August 2, 2005
August 10, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
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