Inorganic Speciation of Dissolved Elements in Seawater: The Influence of Ph on Concentration Ratios

Spectra of microbial fatty acid methyl esters were used to assess the influence of pH on the biofilm and suspended biomass populations within bench scale moving bed bioreactors treating bleached kraft mill effluent. The fatty acid spectral data were reduced by logcontrast canonical component analysis. The first canonical component differentiated biofilm from suspended populations and the second two appeared to indicate an influence of pH on microbial ecology. Thus, the biofilm and suspended microbial communities were distinct, as were the populations acclimated at pH 6 and pH 8. Experimental data for total organic carbon removal suggested that the more recalcitrant fraction of the influent was consumed by the slower growing, high SRT biofilm fraction of the biomass. Since the biofilm ecology was sensitive to pH within typical pH operating limits of full-scale systems, tighter pH control might improve treatment reliability in the event of process transients.

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Prediction of Tissue to Plasma Concentration Ratios of Drugs in the Rat from Experimentally Estimated Volume of Distribution: Application of Allometry

Current Drug Metabolism ◽

10.2174/1389200219666171129114337 ◽

2018 ◽

Vol 19 (2) ◽

pp. 155-164 ◽

Cited By ~ 1

Author(s):

Iftekhar Mahmood

Keyword(s):

Plasma Concentration ◽

Volume Of Distribution ◽

Concentration Ratios

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Kinetics and mechanism of redox reactions of U(III) ions with monochloroacetic and dichloroacetic acids

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19790401 ◽

1979 ◽

Vol 44 (2) ◽

pp. 401-405 ◽

Cited By ~ 2

Author(s):

Ľubica Adamčíková ◽

Ľudovít Treindl

Keyword(s):

Redox Reactions ◽

Reaction Rate ◽

Activation Parameters ◽

Outer Sphere ◽

Alcohol Concentration ◽

Kinetics And Mechanism ◽

Solvent Structure ◽

Influence Of Ph ◽

Sphere Mechanism

The kinetics and mechanism of the redox reactions of U3+ ions with mono- and dichloroacetic acids were studied. The influence of pH was observed mainly in the second case and led to the determination of the rate constants and activation parameters corresponding to two parallel steps, namely oxidation of U3+ with CHCl2COO- ions and oxidation of U3+ with CHCl2.COOH molecules. The influence of binary mixtures of water with methanol, ethanol, isopropanol, or tert-butenol on the reaction rate was followed. Increasing alcohol concentration influences the rate constant not only through changing dielectric constant and solvation of the reactants but also through a change of the solvent structure which plays a role in reactions with an outer sphere mechanism of the electron transfer.

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