The cadmium adsorption capacity of contaminated marine sediments from Hong Kong

Jonathan W C WONG, G. L. Wang

Research output: Contribution to journalJournal articlepeer-review

2 Citations (Scopus)


The binding capacity of Cd to the sediment particles determines the potential of Cd release from the sediments. An experiment was performed to evaluate the adsorption of Cd by contaminated sediments collected from three different locations in Hong Kong, i.e. Kwun Tong, North Point and Nam Tam Wan, having different degrees of pollution. Langmuir and Freundlich equations were used to evaluate the adsorption of Cd by the sediments. Adsorption isotherms obtained from the Freudlich and Langmuir equations were generally linear and the adsorption of Cd by the sediments was significantly correlated with the adsorption maximum and binding energy constant of the Langmuir equation, and equilibrium partition constant of the Freundlich equation. All sediments had a high Cd adsorption capacity and the highly organic contaminated sediments from Kwun Tong had the highest adsorption capacity of 24,272 mg kg-1at pH8. The adsorption of Cd for all sediments increased with a rise in pH of the equilibrium solution and the total organic carbon content of the sediments. Therefore, a change in the sediment chemical equilibrium is likely to reduce the binding capacity.

Original languageEnglish
Pages (from-to)231-241
Number of pages11
JournalToxicological and Environmental Chemistry
Issue number1-4
Publication statusPublished - 1 Dec 1995

Scopus Subject Areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • cadmium in sediment
  • contaminated
  • marine sediment
  • Sediment


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