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Analysis of Selenium in Brazil Nuts by Microwave Digestion and Fluorescence Detection

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Tal M. Nahir

Department of Chemistry, California State University, Chico, CA 95929-0210

Marie-Christine Sheffield

Department of Geosciences, California State University, Chico, CA 95929-0210

J. Chem. Educ., 2002, 79 (11), p 1345

DOI: 10.1021/ed079p1345

Publication Date (Web): November 1, 2002

Abstract

This experiment demonstrates the measurement of selenium concentration in Brazil nuts using closed-vessel microwave digestion and fluorometric spectrophotometry of a selenium(IV) derivative. A three-dimensional excitation–emission fluorescence spectrum shows that the best response is obtained at 378 nm (excitation) and 518 nm (emission). The concentration of selenium in samples is calculated using a standard-addition method.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Fluorescence Spectroscopy

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