Complex formation equilibria of some heavy metals with amino-alcoholic biological buffers

Silvia Canepari, Paola Castellano, Biancamaria Fazio, Antonella Messina

Research output: Contribution to journalArticlepeer-review


The formation of complex species between mercury(II), lead(II) and cadmium(II) and some β-amino-alcohols which are frequently employed as a pH buffer in biological studies is evidenced and discussed. The ligands considered are 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol and tris(hydroxymethyl)-aminomethane and differ from each other as regards the number of hydroxyl groups. From a comparison of the equilibrium data, while the coordination of lead(II) is to be only attributed to the amino group, the hydroxyl groups also seem to contribute to the coordination of cadmium(II). Equilibrium data related to mercury(II) systems could not be deduced from potentiometric measurements, owing to the high strength of the complexes formed.

Original languageEnglish
Pages (from-to)35-43
Number of pages9
JournalAnnali di Chimica
Issue number1-2
Publication statusPublished - Jan 1998

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Science(all)


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