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2000
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August
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In the Laboratory
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Topics in Chemical Instrumentation
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ISE Analysis of Hydrogen Sulfide in Cigarette Smoke
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Guofeng Li, Brian J. Polk, Liz A. Meazell, and David W. Hatchett
Department of Chemistry & Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400
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August 2000
Vol. 77 No. 8
p. 1049
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| Abstract |
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Many advanced undergraduate analytical laboratory courses focus on exposing students to
various modern instruments. However, students rarely have the opportunity to construct their
own analytical tools for solving practical problems. We designed an experiment in which
students are required to build their own analytical module, a potentiometric device composed
of a Ag/AgCl reference electrode, a Ag/Ag2S ion selective electrode (ISE), and a pH meter
used as voltmeter, to determine the amount of hydrogen sulfide in cigarette smoke. Very
simple techniques were developed for constructing these electrodes. Cigarette smoke is
collected by a gas washing bottle into a 0.1 M NaOH solution. The amount of sulfide in the
cigarette smoke solution is analyzed by standard addition of sulfide solution while monitoring
the response of the Ag/Ag2S ISE. The collected data are further evaluated
using the Gran plot
technique to determine the concentration of sulfide in the cigarette smoke solution. The
experiment has been successfully incorporated into the lab course Instrumental Analysis at
Georgia Institute of Technology. Students enjoy the idea of constructing an analytical tool
themselves and applying their classroom knowledge to solve real-life problems. And while
learning electrochemistry they also get a chance to visualize the health hazard imposed by
cigarette smoking.
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| Supplement |
An objective, principles, preparation instructions for the solutions and electrodes, and questions are provided.
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| More Information |
Citation |
Li, Guofeng; Polk, Brian J.; Meazell, Liz A.; Hatchett, David W. J. Chem. Educ. 2000 77 1049.
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Keywords |
Aqueous Solution Chemistry; Electrochemistry; Ion Exchange; Laboratory Instruction; Analytical Chemistry
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History |
Created:
Last Updated: |
July 5, 2000
August 31, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2000
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August
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1049
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