1.Size- Less than 2 mm in diameter .
2.Surface area- The smaller the particle size in a given mass of soil, the greater the surface area.
3.Surface Charge- Have positive or negative electrostatic charges.
4.Adsorption of ions- Negatively charged soil colloids attract cations e.g. Al3+, Ca2+, Mg2+, K+, Na+,H+
while positively charged colloids attract anions e.g. NO3-, SO42-, Cl- 5.
5.Adsorption of water- Colloids attract and hold large number of water molecules due to the polar nature of water molecules.
jim items answered the question on October 19, 2018 at 09:49
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