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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 23 (2018) pp 93-95

Simply Modified Optical Cuvettes for Microscale Process Monitoring: A Solid-Phase Extraction Experiment Illustrating their Fabrication and Use

Paul A. Flowers

Chemistry & Physics Department, University of North Carolina at Pembroke, Pembroke NC 28372,
Received March 5, 2018. Accepted April 18, 2018.

Published: 12 May 2018

Abstract. A versatile approach for modifying standard optical cuvettes to permit their use as microscale reaction vessels in undergraduate chemistry labs is described. This approach is illustrated by a student experiment involving the solid-phase extraction of aqueous dye mixtures using a solution-deposited ion-exchange polymer (Nafion). Visual observations and photometric measurements are used to determine the film’s equilibration time, charge selectivity, and extraction efficiency for a cationic dye, methylene blue, both alone in solution and in the presence of an anionic dye, tartrazine. This experiment has been implemented in several different laboratory sections of a sophomore analytical chemistry course, yielding consistently good results and generating considerable student interest. Suggestions are provided for several variations and extensions of this general experimental scheme.

Key Words: Laboratories and Demonstrations; analytical chemistry; microscale; solid-phase extraction

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Article in PDF format (231 KB) HTML format

Supporting Materials:

Two PDF files are available as supporting material; a student handout and instructor notes. (786 KB)

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