Hands-On Model of the Principle of Isotope Dilution Analysis for Use in an Interactive Teaching and Learning Classroom Exercise
Artikel i vetenskaplig tidskrift, 2021

A simple hands-on model for illustrating the concept of isotope dilution analysis (IDA) has been devised. The model consists of two sets of beads of different sizes, with one set representing atoms of the analyte and the other set representing solvent water molecules. Phase separation is mimicked by sieving the beads, and the results are detected according to the color of the analyte beads. In this paper, the following three IDA methods are illustrated using the model: (1) direct IDA, (2) substoichiometric IDA, and (3) IDA-assisted neutron activation analysis. The model was demonstrated for a small group of graduate students with previous knowledge of nuclear chemistry, and the response from an inquiry held after the demonstration was good. It is suggested that the model can be used in a dry chemistry laboratory exercise to demonstrate the methodological differences between the different IDA methods, without the need for costly radioisotopes or irradiation facilities. It can also be used as a tool for engaging students in meta-modeling activities.



Analytical Chemistry

Hands-On Learning/Manipulatives

Upper-Division Undergraduate


Stellan Holgersson

Chalmers, Kemi och kemiteknik, Energi och material

Journal of Chemical Education

0021-9584 (ISSN) 1938-1328 (eISSN)

Vol. 98 4 1208-1220


Annan data- och informationsvetenskap

Farmaceutisk vetenskap

Övrig annan teknik



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