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Selenium immobilization in evaporation pond sediments by in situ precipitation of ferric oxyhydroxide

Article Abstract:

An in situ chemical treatment to immobilize selenium in agricultural and pond waters by promoting the oxidation of Fe(II) to FeOOH in sediments and to determine ambient physical and chemical properties of sediments collected from Kesterson Reservoir in Merced County, CA, was developed. Treated samples where soluble selenium was immobilized was strongly dependent on initial selenium concentration, while majority of selenium in untreated samples was reduced and insoluble. The extraction of selenium by different compounds was also shown to generally decrease with increasing Fe(II) concentration.

Pollution, Water pollution, Selenium, Selenium (Chemical element), Iron oxides, Kesterson Reservoir

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In situ dynamics of aromatic hydrocarbons and bacteria capable of AH metabolism in a coal tar waste-contaminated field site

Article Abstract:

Dynamic co-transport of both organic contaminants and contaminant-degrading microorganisms was gleaned from analyses of sorbents periodically retrieved from a coal tar waste-contaminated field site. This is strongly indicated by the fact that both contaminants and contaminant-metabolizing microorganisms were mobile. Contaminant concentrations increased during a 15-day period and gradually declined. Naphthalene- and phenanthrene-utilizing bacteria were both mobile and reached peak titers of 10(superscript 4) and 10(superscript 3.3), respectively, within 11 days.

Analysis, Organic compounds, Polycyclic aromatic hydrocarbons

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Kinetic study of the speciation of copper (II) bound to a hydrous ferric oxide

Article Abstract:

A study has investigated the kinetic speciation of copper(II) (CuII) binding to hydrous ferric oxides. Kinetic studies suggests greater heterogeneity than previous equilibrium methods of Cu(II) speciation. Equilibrium methods failed to distinguish different binding sites for Cu(II).

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