Predicting relative toxicity and interactions of divalent metal ions: Microtox® bioluminescence assay
Both relative toxicity and interactions between paired metal ions were predicted with least-squares linear regression and various ion characteristics. Microtoxr̀ 15 min EC50s (expressed as free ion) for Ca(II), Cd(II), Cu(II), Hg(II), Mg(II), Mn(II), Ni(II), Pb(II), and Zn(II) were most effectively modeled with the constant for the first hydrolysis (KH for Mn+ + H2O → MOHn-1 + H+) although other ion characteristics were also significant in regression models. The [log KH] is correlated with metal ion affinity to intermediate ligands such as many biochemical functional groups with O donor atoms. Further, ordination of metals according to ion characteristics, e.g., [log KH], facilitated prediction of paired metal interactions. Pairing metals with strong tendencies to complex with intermediate or soft ligands such as those with O or S donor atoms resulted in strong interactions.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 2496748
- Alternate ID(s):
- OSTI ID: 215598
- Journal Information:
- Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 3 Vol. 15; ISSN 0730-7268
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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