Summary 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.
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Ford et al. (1969) studied this question.