A generic biotic ligand model quantifying the development in time of Ni toxicity to Enchytraeus crypticus

Erkai He, Hao Qiu, Katya Dimitrova, Cornelis A.M. Van Gestel

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Biotic ligand models (BLMs) predicting metal toxicity for a fixed exposure time are available, but it is uncertain how to extrapolate predictions to a dynamic environment with time-variable exposure. Three BLM-based models were developed to describe change of Ni toxicity to Enchytraeus crypticus in time. These models assumed that: (a) biotic ligand binding constants of Ni and competing cations (KNiBL and KCBL) and the fraction of biotic ligands occupied by Ni to produce 50% mortality (f50) are fixed with time, (b) KNiBL and KCBL remain constant while f50 varies with time, and (c) KNiBL, KCBL, and f50 are all time-dependent. Model (a) successfully described the 7-d toxicity of Ni but failed in explaining Ni toxicity at longer exposure times. Both models (b) and (c) well described Ni toxicity, within a factor of 2, at varying solution chemistries and different exposure times. This shows that the acute BLM cannot directly be applied for predicting chronic metal toxicity and that some BLM parameters may vary with time. Our findings provide plausible explanations for differences in mechanisms of acute and chronic toxicity, offering a framework for incorporating toxicokinetic and toxicodynamic processes in describing Ni toxicity in time.
Original languageEnglish
Pages (from-to)170-176
Number of pages7
Early online date2 Jan 2015
Publication statusPublished - Apr 2015

Bibliographical note

Erkai He received a PhD Grant (2011638012) from the China Scholarship Council. The authors are grateful to Rudo Verweij and Nico M. Van Straalen, for supporting the data analysis, experimental work and manuscript preparation.


  • Enchytraeus crypticus
  • Ni
  • toxicodynamic
  • biotic ligand model


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