The effect of major cations on the toxicity of cadmium to Folsomia candida in a sand-solution medium analyzed by biotic ligand modeling

Masoud M. Ardestani*, Cornelis A.M. van Gestel

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

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Abstract

The aim of this study was to assess the effect of major cations (Ca2+, Mg2+, Na+, K+, and H+) on cadmium toxicity to the springtail Folsomia candida. Survival of the animals was determined after seven days exposure to different cadmium concentrations in an inert sand-solution medium, in different experimental setups with modification of the cation concentrations. Among the cations tested, Ca2+ and Mg2+ had protective effects on the toxicity of cadmium to the springtails while Na+, K+, and H+ showed less competition with free cadmium ions for binding to the uptake sites of the collembolans. Toxicity predicted with a biotic ligand model agreed well with the observed values. Calculated conditional binding constants and the fraction of biotic ligands occupied by cadmium to show 50% effects were similar to values reported in the literature. The results emphasize the important role of solution chemistry in determining metal toxicity to soil invertebrates.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalEnvironmental Pollution
Volume246
Early online date26 Nov 2018
DOIs
Publication statusPublished - Mar 2019

Keywords

  • Bioavailability
  • Conditional binding constant
  • Metal
  • Soil
  • Springtail
  • Survival

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