01 · Definition
What it is
Chelation is the binding of a metal ion by an organic molecule into a stable, ring-shaped complex. The word comes from the Greek χηλή (khēlē), “claw”, describing the geometry: the molecule's donor atoms wrap around the ion from several sides.
Not all metal binding is chelation. A single-point binder lets go easily; a chelator attaches at two, three or more points and holds. Humic substances, including fulvic acid, are known chelators.