JCE Online Journal of Chemical Education
 | Subscriptions  | Software Orders  | Support  | Contributors  | Advertisers  | 

JCE Print
   Current Issue
 Previous Issues
 Supplements
 Search JCE Index

JCE Digital Library
   DigiDemos
 QBank
 SymMath
 WebWare

JCE Software
   Latest Releases
 Software & Video
 Downloads
 Support

Only@JCE Online
   JCE Online Store
 JCE HS CLIC
 JCE Discussion Forums
   Biographical Snapshots
 ChemEd Resource Shelf
 Featured Molecules
 Hal's Picks
 Project Chemlab
 Reviewed WWW Sites
 "Web-Ed" Articles

About JCE
   Features
 Publications
 Operations
 Outreach
 Contact Us


  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > November  >
In the Laboratory
Analysis of Selenium in Brazil Nuts by Microwave Digestion and Fluorescence Detection
Marie-Christine Sheffield
Department of Geosciences, California State University, Chico, CA 95929-0210

Tal M. Nahir
Department of Chemistry, California State University, Chico, CA 95929-0210
Cover
November 2002
Vol. 79 No. 11
p. 1345
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.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2002p1345W.doc (Microsoft Word)
*  Download
JCE2002p1345W.pdf

JCE2002p1345W.zip

JCE2002p1345W.sit
More Information
*  Citation
 Sheffield, Marie-Christine; Nahir, Tal M. J. Chem. Educ. 2002 79 1345.
*  Keywords
 Analytical Chemistry; Fluorescence Spectrometry; Food Science; Instrumental Methods; Quantitative Analysis; Selenium
*  History
 Created:
Last Updated:		 September 30, 2002
March 16, 2005
<< Previous Article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > November  > Page 1345


Subscriptions
 Subscription Info
 Order Forms

JCE HS CLIC

Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
 JCE HS CLIC

Contributions Welcome
JCE welcomes your submission
 Contributors' Corner

Advertisers
In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first.
 Recent Advertisers

Be An Ambassador
Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants.
 Outreach with JCE

Comments to
jceonline@chem.wisc.edu		 Copyright © Division of Chemical Education, Inc., American Chemical Society.
All rights reserved.