Chelation

noun

1. the process of removing a heavy metal from a solution by means of a chelate
2. the process of forming a ring by forming one or more hydrogen bonds.
3. the formation of a polydentate chelate compound from a metal salt
4. the use of this process to remove metal ions from solution, especially to counter poisoning by heavy metals
5. (medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning