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ERIC Number: EJ943663
Record Type: Journal
Publication Date: 2011-Sep
Pages: 4
Abstractor: As Provided
Reference Count: 11
ISSN: ISSN-0021-9584
Using a Flatbed Scanner to Measure Detergency: A Cost-Effective Undergraduate Laboratory
Poce-Fatou, J. A.; Bethencourt, M.; Moreno-Dorado, F. J.; Palacios-Santander, J. M.
Journal of Chemical Education, v88 n9 p1314-1317 Sep 2011
The efficiency of a laundry-washing process is typically assessed using reflection measurements. A spectrometer and an integrating sphere are used to obtain the reflection data. The similarities between this equipment and a commercially available flatbed scanner are examined, and the way a flatbed scanner can be used to obtain detergent efficiencies is described. A flatbed scanner can be viewed as a singular spectrometer capable of obtaining spectral information concentrated in three regions of the visible spectrum. These data are stored in image files as coordinates in the red-green-blue (RGB) space where colors are represented by mixture of red, green, and blue in an 8-bit scale, that is, in a range where the intensities of these colors vary from 0 to 255. Detergent efficiencies calculated with these devices are compared. Washing tests on linseed-oil-impregnated white polyester fabrics are performed using sodium dodecyl sulfate with mass concentrations ranging from 0.00 to 1.00%. The results demonstrate that a flatbed scanner is a valuable and economical alternative to calculate detergent efficiencies in a wide variety of circumstances. (Contains 2 tables and 4 figures.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A