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colloid


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1 A substance that is composed of two homogeneous phases, one of which is dispersed in the other.

2 (pedol.) Soil colloids are substances of very small particle size, either mineral (e.g. clay) or organic (e.g. humus), which therefore have a large surface area per unit volume. Colloids usually provide surfaces with high cation exchange capacity, and also exhibit an instability controlled by soil chemistry.

Subjects: Chemistry — Biological Sciences.


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