A new insight into a problem of mediating effects of humic acids on binding and biological effects of organic pollutants in natural soil

Alexanderova, Olga N.

doi:10.1007/s11368-015-1195-2

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…They found that the dissolved organic carbon (DOC) is a clear indicator of technogenic OM mobility, and the DOC variations were strongly linked with the silt fraction and the occurrence of vegetation cover after freeze-thaw cycles, heating wet soil, and heating on dry soil cycles. Alexanderova (2015) investigated the implicit mediating activity of humic acids (HA) by the interaction between pollutants and soil through the electrochemical influence of HA on an active (hydrolisable) part of soil. The authors found different binding effects accompanied by different biological effects of pollutants in dependence on the amine base.…”

Section: Mining Site Soilsmentioning

confidence: 99%

Preface

Bech

2015

J Soils Sediments

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Section: Mining Site Soilsmentioning

confidence: 99%

Preface

Bech

2015

J Soils Sediments

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“…18 Another recent study has demonstrated that aliphatic and aromatic compounds have different binding mechanisms with humic acid. 19 Malachite green has been studied as a model pollutant and it was shown that more than one binding site with humic acid exists. 20 Fluorescence quenching is a useful technique in studying the interaction between two molecules, a fluorophore (M) and its quencher (Q).…”

Section: Introductionmentioning

confidence: 99%

A Fluorescence Quenching Analysis of the Binding of Fluoroquinolones to Humic Acid

2017

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Fluorescence quenching was used to investigate the interaction of six fluoroquinolones with humic acid. Static quenching was observed for the binding of ciprofloxacin, enoxacin, fleroxacin, levofloxacin, norfloxacin, and ofloxacin to humic acid. The equilibrium binding constants were found from Stern-Volmer plots of the data. The quenching experiments were repeated over a temperature range of 25-45 ℃ and van't Hoff plots were generated. From these linear plots, thermodynamic values were calculated for Δ H, Δ G, and Δ S for each of the fluoroquinolones. The equilibrium binding constants were found to be <1 for all the antibiotics studied. The calculated ΔH values were all negative and ranged from -9.5 to -27.6 kJ/mol. The high water solubility of the antibiotics and low ΔH of binding suggests that the antibiotics will be transported easily through the environment. Finally, whether the fluoroquinolones are in a protonated, deprotonated, or partially protonated state is found to correlate to the strength of binding to humic acid.

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