Speciation of Dissolved Cadmium: Interpretation of Dialysis, Ion Exchange and Computer (Geochem) Methods

Peter Engelund Holm, Sjur Andersen, Thomas Højlund Christensen

    Research output: Contribution to journalJournal articleResearchpeer-review


    Equilibrium dialysis and ion exchange methods, as well as computer calculations
    (GEOCHEM), were applied for speciation of dissolved cadmium (Cd) in test solutions and leachate samples. The leachate samples originated from soil, compost, landfill waste and industrial waste. The ion exchange (IE) method separates dissolved Cd into free divalent Cd (Cd 2+) and complexed Cd and
    furthermore separates the latter into the operationally defined forms: labile, slowly labile and stable complexes. The dialysis (ED) method determines high molecular weight Cd complexes (above 1000mol. wt). For both methods the reproducibility was good. By combining the results of the GEOCHEM calculations in terms of the inorganic complexes, and the IE results, the fractions of free and
    inorganically complexed Cd were estimated. The IE and ED results furthermore provided information about the organic complexes. Selected environmental leachates showed different Cd speciation patterns as expected. Some leachates were dominated by free divalent Cd (1-70%), some by inorganic complexes
    (1-87%), and some by organic complexes (7-98%).
    Original languageEnglish
    JournalWater Research
    Issue number3
    Pages (from-to)803-809
    Publication statusPublished - 1995


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