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2007
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February
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In the Laboratory
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Extending the Marine Microcosm Laboratory
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Hal Van Ryswyk, Eric W. Hall, Steven J. Petesch, and Alice E. Wiedeman
Department of Chemistry, Harvey Mudd College, Claremont, CA 91711-5990
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February 2007
Vol. 84 No. 2
p. 306
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| Abstract |
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The marine microcosm laboratory has been adopted in a range of analytical chemistry laboratory courses. Originally devised as a means to promote appreciation, understanding, and historical awareness of classical analysis while bringing real-world motivation into the instructional laboratory, the marine microcosm laboratory allows students to consider the entire analytical process from beginning to end within the context of a complex, self-contained laboratory ecosystem. We present three extensions to bring pedagogically useful chemistry emphasizing material typically taught in the chemical analysis, instrumental methods, and biochemistry courses into the marine microcosm laboratory while mitigating chemical hazards associated with one of its venues. Specifically, we incorporate the determination of ammonia via ion-selective electrode using the method of standard additions; sulfate via ion chromatography with an internal standard; and nitrate via enzymatic reduction with spectrophotometric detection.
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| Supplement |
Instructions for the students and details notes about the three extensions are available.
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| More Information |
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Citation |
Van Ryswyk, Hal; Hall, Eric W.; Petesch, Steven J.; Wiedeman, Alice E. J. Chem. Educ. 2007 84 306.
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Keywords |
Analytical Chemistry; Aqueous Solution Chemistry; Chromatography; Environmental Chemistry; Enzymes; Ion Exchange; Ion Selective Electrodes; Quantitative Analysis; Student-Centered Learning; Upper-Division Undergraduate
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History |
Created:
Last Updated: |
1/9/2007
2/16/2007
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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