Table

Important Physicochemical Characteristics of Some Representative Freshwater Colloids

Nature of colloid and macromolecule

Small, organic molecules including amino acids, hydroxy acids, peptides, monosaccharides Humic substances (including fulvic and humic acids and the so-called marine humic acids)

Proteins

Reserve polysaccharides Structural polysaccharides Peptidoglycans

Molar mass or specific surface area

Site or charge density

Non living organic compounds

Molar mass < 1 kDa Variable

Molar mass 0.5-5 kDa, spherical Electrical charge of —2 to

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