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Decomposition of hydroxybenzoic and humic acids in water by ultrasonic irradiation

Article Abstract:

A study of sonochemical decomposition of various hydroxybenzoic and humic acids in aqueous media under argon atmosphere reveals that this mainly advances via reactions with OH radicals in the bulk solution. Under air atmosphere, oxygen molecules participate in the decomposition of polyhydroxybenzoicc acids at the interface. Under both atmospheres, thermal decomposition in cavitation bubbles and the interface region is minimal. More efficient utilization of OH radicals is needed to enhance the decomposition yield.

Humic acid, Humic acids, Benzoic acid

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Evaluation of a log-normal distribution first-order kinetic model for copper(II)-humic acid complex dissociation

Article Abstract:

The introduction of a model based on a log-normal distribution of first-order rate constants to the kinetics of copper(II)-humate dissociation reactions is discussed. A pseudo-stopped-flow spectrophotometric technique was used to perform the experiments while binary percent transmission data for the numerical analysis was produced by a spectrophotometer. The log-normal model was able to describe well data from the nonlabile component of the copper reactions.

Analysis, Usage, Molecular dynamics, Copper ions, Lognormal distribution

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Response of copper(II)-humic acid dissociation kinetics to factors influencing complex stability and macromolecular conformation

Article Abstract:

A study has investigated the decomposing metal-organic interaction of copper(II) and humic acid in soil. Investigation evaluated the effect of pH and the ratio of copper to humic acid on dissociation kinetics. Experiments were conducted in aqueous solution with high levels of copper and humic acid. Experiments revealed only small changes in balance can influence dissociation.

Soil science, Dissociation, Dissociation reactions

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