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The WQA Glossary of Terms
This Glossary is published by the Water Quality Association (WQA) as a service to members and leaders in education, government, and industry.
© Copyright 2010 by Water Quality Association
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C
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Colloids
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Wednesday,Aug 18, 1999
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Very fine solid particles, typically between 0.1 and 0.001 microns in diameter, which are suspended in a liquid or gas and will not settle out of a solution and cannot be removed by conventional filtration alone.
When in sufficient concentrations, colloidal matter may give a grayish cast to a standing water sample.
The removal of colloidal particles usually requires coagulation to form larger particles which may then be removed by sedimentation and/or filtration.
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