Microscopic examination of silt grains from soils shows them to be coated with a brown, clay-like film that makes mineral identification difficult or impossible. Minerals like zircon, tourmaline, rutile and other heavy minerals are less affected by the coating than are feldspar and quartz. This latter pair make up the largest fraction of the silt and the inability to distinguish between them rapidly and easily is important. Washing with distilled water and dispersion with sodium metaphosphate failed to remove the brown coating from the silt grains. It was decided to attempt removal of the coating by ultrasonic cleaning. The instrument chosen was a Bendix UC-4 ultrasonic cleaner.
Proceedings of the Iowa Academy of Science
©1957 Iowa Academy of Science, Inc.
Biggs, Donald L.
"Cavitation as a Means of Cleaning Silt Grains,"
Proceedings of the Iowa Academy of Science, 64(1), 382-384.
Available at: https://scholarworks.uni.edu/pias/vol64/iss1/38