螯合物在化学上叫做络合物,是一类配位化合物。它是由一个大分子配位体与一个中心金属原子连接所形成的环状结构。能与金属离子起螯合作用的有机分子化合物称为螯合剂,或叫配体。螯合剂在植物的细胞中能有选择地捕捉某些金属离子,又能在必要时适量释放出这种金属离子。由于螯合剂具有对金属离子的“擒”(吞或捕 Chelates chemically called complexes, is a class of coordination compounds. It is a macromolecular ligand with a central metal atom formed by the connection of the ring structure. Organic molecules that chelate metal ions are called chelators, or ligands. Chelating agents selectively trap certain metal ions in the cells of the plant and, if necessary, release the metal ions in moderation. Since chelating agents have a “trap” (swallowing or catching) of metal ions