Metal ion buffer - Misplaced Pages

A metal-ion buffer provides a controlled source of free metal ions in a manner similar to the regulation of hydrogen ion concentration by a pH buffer A metal-ion buffer solution contains the free (hydrated) metal ion along with a complex compound formed by the association of the ion with a ligand in excess. The concentration of free metal ion depends on the total concentration of each component (ligand and metal ion) as well as on the stability constant of the complex. If the ligand can undergo protonation, the concentration of the free metal ion depends also on solution pH.

A considerable improvement in the detection limit of a liquid-membrane ion-selective electrode has been achieved by using a metal-ion buffer as internal solution.

References

D. D. Perrin, B. Dempsey, (1974) Buffers for pH and Metal Ion Control, Chapman and Hall, London, ISBN 978-0-412-21890-3 (Print) 978-94-009-5874-6 (Online).
Pretsch, E. (2007) The new wave of ion-selective electrodes. Trac-Trends Anal. Chem. 26, 46-51

v t e Chemical equilibria
Concepts	Chemical stability Chelation Dynamic equilibrium Equilibrium chemistry Equilibrium stage Free energy Gibbs Helmholtz Le Chatelier's principle Phase separation Reversible reaction Thermodynamic equilibrium
Models	Equilibrium constant determination Phase diagram Predominance diagram Phase rule Reaction quotient Thermodynamic activity
Applications	Buffer solution Equilibrium unfolding Liquid–liquid extraction
Specific equilibria	Acid dissociation Hammett acidity function Binding constant Binding selectivity Coordination complexes Macrocyclic effect Dissociation constant Hydrolysis Self-ionization of water Partition Distribution coefficient Solubility Common-ion effect Vapor–liquid Henry's law

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