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An Attenuated Total Reflectance Sensor for Copper: An Experiment for Analytical or Physical Chemistry

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Tanya Shtoyko , Imants Zudans , Carl J. Seliskar and William R. Heineman

Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221

John N. Richardson

Department of Chemistry, Shippensburg University, Shippensburg, PA 17257

J. Chem. Educ., 2004, 81 (11), p 1617

DOI: 10.1021/ed081p1617

Publication Date (Web): November 1, 2004

Abstract

This article describes an optical reagent-mediated sensor for copper, where the ligand 1-(2-pyridylazo)-2-naphthol (PAN) is immobilized in a sensor cation-selective Nafion film. Cu²⁺ is detected optically by partitioning into the film and complexing with the film-immobilized PAN to form the intensely colored complex ion CuPAN⁺. While most optical sensors rely on a conventional transmittance configuration to measure absorbance, we employ attenuated total reflectance (ATR) at 550 nm to detect CuPAN⁺ formed in situ in the Nafion film. This experiment offers students exposure to the cutting edge analytical technique of optical ATR sensing, as well as to classical topics such as generation of a standard curve, UV–vis spectroscopy, volumetric characterization of inorganic complex ion stoichiometry via microtitration, determination of isosbestic point, and manipulation of thin films.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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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 ...
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