Soil colloids

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Soil colloids are roughly distributed soil particles that are predominantly negatively charged. As a result, they mainly bind cations and only a few anions . If there was no bond between the ion and the soil colloid, the ion could be washed out. Due to the low binding capacity of the soil colloids for anions, the anions are in solution and can be washed out. But there is a steady supply from the liquid phase of the soil. So the soil colloids act as ion stores or buffers.