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ERIC Number: EJ820861
Record Type: Journal
Publication Date: 2007-Nov
Pages: 3
Abstractor: As Provided
Reference Count: 5
ISSN: ISSN-0021-9584
New Analytical Method for the Determination of Detergent Concentration in Water by Fabric Dyeing
Seng, Set; Kita, Masakazu; Sugihara, Reiko
Journal of Chemical Education, v84 n11 p1803-1805 Nov 2007
The use of harmful organic solvents in classrooms has become a critical issue of concern in the field of chemistry education. This article describes a classroom activity at a high school in which an acrylic fabric was used as the extraction medium in the analysis of the detergent concentration in water instead of organic solvents. Dyes were used to combine with the detergent in solutions of different concentration. The colored, dye-detergent compound produced was then extracted by adsorption onto fabric. Sodium dodecyl sulfate (SDS) was used as the detergent and a new inexpensive handmade reflection photometer, assembled with inexpensive materials such as LED, PVC tube, and CdS sensor, was used to determine the color depth of the dyed fabric. The calibration curves of color depth versus the SDS concentration can be used to determine the unknown concentration of the SDS solution. The experimental results indicate that this harmless and environmentally friendly analytical method for determining detergent concentration can be safely introduced into schools. (Contains 5 figures.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools; Secondary Education
Audience: Students
Language: English
Sponsor: N/A
Authoring Institution: N/A