Background: In Owerri and its surrounds, the Otamiri River serves as a supply of water for household activities, urban farming, recreation, and aquatic foods. The municipality also sends it untreated home, industrial, and agricultural waste water and runoffs. Seepages from solid waste dumps along the river's banks, as well as sand mining operations in the river, might pose environmental risks.
The goal of this investigation is to see how the ternary mixes of sodium dodecyl sulphate (SDS) and various divalent metals interact with the predominant bacteria (Serratia marcescens (SerEW01) from the river.
The study employed a fixed ratio ray design with suppression of dehydrogenase activity as the end aim.
The study will take place in Owerri, Imo State, Nigeria, from June to December 2019.
Methodology: The bacteria was previously isolated from river water as the preponderant bacterium isolate. SDS + Pb + Zn, SDS + Cd +Zn, SDS + Pb +Ni, SDS + Ni + Cd, SDS + Co + Pb, and SDS + Co + Cd fixed ratio ternary mixes (Equieffect concentration (EEC50) and arbitrary concentration (ABCR) ratios), SDS + Pb + Ni, SDS + Ni + Cd, SDS + Co + Pb, and SDS + Co + Cd were used The experimentally measured toxicities were compared to toxicities predicted by concentration addition (CA) and independent action (IA) models.
The reported EC50S varied from 0.046 0.003 mM (Zn) to 2.329 0.092 mM. (SDS). The toxicants' EC50S were significantly distinct from one another (P0.05). SDS >Pb >Ni > Co > Cd(II) >Zn was the sequence of increasing toxicity. Toxicity was shown to be dose-dependent, with gradual reduction of dehydrogenase activity as concentration rose. Both the experimentally obtained, CA, and IA-predicted EC50S were statistically different in all ternary mixes. In comparison to the experimental results, both models projected decreased toxicities. The Toxic Index and Model Deviation Ratio suggested that SDS and metal ions had a synergistic effect against S. marcescens (SerEW01)
Conclusion: This research might serve as a starting point for determining the potential environmental risks associated with the co-contamination of the environment by SDS and divalent heavy metals, especially when both pollutants are widespread aquatic contaminants.
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