|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
1999
>
September
> |
|
In the Laboratory
|
|
|
|
Determination of Anionic Surfactants Using Atomic Absorption Spectrometry and Anodic Stripping Voltammetry
|
Richard John and Daniel Lord
School of Applied Science, Griffith University, Gold Coast Campus, Parklands Drive Southport Gold Coast, QLD, 4214, Australia
|
|
September 1999
Vol. 76 No. 9
p. 1256
|
|
|
|
|
|
|
| Abstract |
|
An experiment has been developed for our undergraduate analytical chemistry course that demonstrates the indirect analysis of anionic surfactants by techniques normally associated with metal ion determination; that is, atomic absorption spectroscopy (AAS) and anodic stripping voltammetry (ASV). The method involves the formation of an extractable complex between the synthetic surfactant anion and the bis(ethylenediamine)diaqua copper(II) cation. This complex is extracted into chloroform and then back-extracted into dilute acid. The resulting Cu(II) ions are determined by AAS and ASV. Students are required to determine the concentration of a pre-prepared "unknown" anionic surfactant solution and to collect and analyze a real sample of their choice. After the two extraction processes, students typically obtain close to 100% analytical recovery. Correlation between student AAS and ASV results is very good, indicating that any errors that occur probably result from their technique (dilutions, extractions, preparation of standards, etc.) rather than from the end analyses.
The experiment is a valuable demonstration of the following analytical principles: indirect analysis; compleximetric analysis; liquid-liquid (solvent) extraction; back-extraction (into dilute acid); analytical recovery; and metal ion analysis using flame-AAS and ASV.
|
| Supplement |
Supplementary material provided is in the form of a Microsoft Word for Windows document, consisting of Lab Documentation (Lab Summary, experimental notes for students, and general information for the successful running of this experiment). It has been compressed into zip (for Windows) and sit (for Macintosh) files. A pdf is also available, accessible with Acrobat Reader.
|
 Contents |
|
| Download |
|
|
| More Information |
Citation |
John, Richard; Lord, Daniel. J. Chem. Educ. 1999 76 1256.
|
Keywords |
Instrumental Methods; Electrochemistry; Environmental Chemistry; Water / Water Chemistry; Laboratory Instruction; Atomic Spectroscopy; Analytical Chemistry
|
History |
Created:
Last Updated: |
July 30, 1999
November 22, 2005
|
|
|
|
|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
1999
>
September
> Page
1256
|
|
|
| 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.
|
| Contributions Welcome |
| JCE welcomes your submission |
| 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. |
| 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. |
|
