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Toxicities of senary and septenary mixtures of five metals and two phenols to Pseudomonas fluorescens

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Author Affiliations

  • 1Department of Microbiology, Federal University of Technology Owerri, P.M.B 1526 Owerri, Nigeria
  • 2Department of Microbiology, Federal University of Technology Owerri, P.M.B 1526 Owerri, Nigeria
  • 3Department of Microbiology, Federal University of Technology Owerri, P.M.B 1526 Owerri, Nigeria
  • 4Department of Microbiology, Federal University of Technology Owerri, P.M.B 1526 Owerri, Nigeria

Int. Res. J. Biological Sci., Volume 9, Issue (2), Pages 19-31, May,10 (2020)

Abstract

Toxicities of senary (Ni(II) + Co(II) + Zn(II) + Cd(II) + Pb(II) + 2-Chlorophenol and Ni(II) + Co(II) + Zn(II) + Cd(II) + Pb(II) + Phenol) and septenary (Ni(II) + Co(II) + Zn(II) + Cd(II) + Pb(II) + Phenol + 2-Chlorophenol) mixtures of five metals and two phenols to Pseudomonas fluorescens were assessed through dehydrogenase inhibition. Fixed ratio mixtures comprising equieffect concentration ratio (EECR) mixtures and arbitrarily chosen mixture ratios (ABCR) were used to determine the joint effects of these heavy metals in mixture with either 2-chlorophenol or phenol or both. The concentration-response relationships of all the toxicants and their mixtures were describable by logistic model. Generally, concentration addition (CA) predicted higher toxicities than independent action (IA) models. The mixture toxicities were generally synergistic. This is of environmental concern and underlines the hazard in discharging effluents containing phenols and heavy metals.

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