SEPARATION OF THE LIGHT FRACTION FROM SOILS BY ULTRASONIC DISPERSION IN HALOGENATED HYDROCARBONS CONTAINING A SURFACTANT.

Partially humified material can be separated from other soil material by flotation on a bromoform-petroleum spirit mixture of density 2·0 g cm^-3. Maximum recovery of partially humified material requires ultrasonic dispersion and the addition of a surfactant to the suspension. For large-scale work'Nemagon' may be used in place of the bromoform-petroleum spirit mixture. [ABSTRACT FROM AUTHOR]