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CH3041
COMPLEXING LIGANDS
•Microorganisms release strongly chelating, metal complexing ligands into the water:
•1) Transport ligands  (bacteria, algae)
- hydroxamate siderophores
- catechol siderophores
• 2) Detoxifying ligands
- polypeptides (cysteine rich)
- bind several Mn+ each
plants: phytochelatins
animals:
metallothioneins