Experimental study and modelling of inorganic Cd2+ speciation in natural waters

Claudia Foti, Gabriele Lando, Frank J. Millero, Silvio Sammartano

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

An analysis of literature data together with new potentiometric and voltammetric studies on the interaction between Cd2+ and the common environmental inorganic ligands, such as OH-, Cl-, F -, CO32- and SO42-, was reported at t = 25°C. New formation constant values for CdCl+, CdCl20, CdCl(OH)0, CdSO4 0, CdCO30 and CdF+ species at different ionic strengths (0.1 ≤ I ≤ 1molL-1) were determined. The cumulative seawater ligand capacity was evaluated by using a model in which synthetic seawater is expressed as a single salt BA, where the major cations (Na+, K+, Ca2+ and Mg2+) are represented by a single cation Bz+ and the anions (Cl- and SO42-) by a single anion Az-(|z| = 1.117). The formation of CdA0.883+ and CdA(OH)0.117- species was proposed and formation constants are reported at different salinities (5 ≤ S ≤ 45). The ionic strength dependence of the stability constants was studied by means of Pitzer and SIT (Specific ion Interaction Theory) equations.

Original languageEnglish (US)
Pages (from-to)320-331
Number of pages12
JournalEnvironmental Chemistry
Volume8
Issue number3
DOIs
StatePublished - Jun 29 2011

Keywords

  • cadmium(II)
  • hydrolysis
  • inorganic ligands
  • ionic strength dependence

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Environmental Chemistry
  • Geochemistry and Petrology

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