Metal ion buffer
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
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.[2]
References
- 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
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