Foam on the Water
Foam is often seen along lake shores and on streams and rivers. Most foam is natural and does not indicate pollution. Foam forms when water is mixed with air, such as by a waterfall or waves breaking against shore. Plants and animals release organic compounds as they decompose, and these compounds lessen the surface tension of water and create bubbles.
Biodegradable detergents and reduction of pollution from wastewater treatment plants have reduced the occurrence of pollution-related foam. If the foam smells fragrant or perfumey, it may be from a nearby spill or waste discharge pipe. Natural foam may smell fishy or earthy, and may be white, off-white, or brownish, and breaks apart easily when disturbed.
December 30, 2005 7:49 AM | Category: Chemicals