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
   JCE DLib Catalog
   ChemInfo
 Data-Driven Exercises
 DigiDemos
 Featured Molecules
 LivTexts
 LrnCom
 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
 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 > 2004  > August  >
In the Laboratory
Pressure-Assisted Chelating Extraction as a Teaching Tool in Instrumental Analysis
Omowunmi A. Sadik, Adam K. Wanekaya, and Gelfand Yevgeny
Department of Chemistry, State University of New York at Binghamton, Binghamton, NY 13902-6016
Cover
August 2004
Vol. 81 No. 8
p. 1177
Abstract
This article describes a laboratory procedure designed for a junior-level instrumental analysis course using a pressure-assisted chelating extraction (PACE) technique to digest heavy metals from solid matrices. PACE can achieve the digestion of metals through direct contact between solids and chelates under controlled temperature and pressure. After digestion, the metals can be analyzed using flame atomic absorption spectroscopy (FAAS). The exercise requires two three-hour laboratory periods. In one lab period, students use a wet acid-digestion technique to remove heavy metals from sediment samples and analyze them using FAAS. In the second lab period, students digest the samples using PACE and similarly analyze the sediment samples by FAAS. The PACE results are then compared with the results from wet acid-digestion. In the experiments performed by the students, mean lead recoveries were 95% with an RSD of 10% with PACE, and 111% with an RSD of 37% with the acid-digestion technique. The PACE approach allows students to gain sample preparation skills using nonhazardous reagents. The combination of PACE with FAAS enabled the students to develop a greater appreciation and understanding of the highly automated, modern instrumental techniques, including sample preparation.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2004p1177W.doc (Microsoft Word)
 
*  Download



 
More Information
*  Citation
 Sadik, Omowunmi A.; Wanekaya, Adam K.; Yevgeny, Gelfand. J. Chem. Educ. 2004 81 1177.
*  Keywords
 Analytical Chemistry; Atomic Spectroscopy; Environmental Chemistry; Green Chemistry; Instrumental Methods; Laboratory Instruction; Lead; Metals; Quantitative Analysis
*  History
 Created:
Last Updated:		 June 17, 2004
August 10, 2004
<< Previous article Table of Contents Next Article >>
  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > August  > Page 1177


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's 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.