Protocol for the analysis of high concentrations of benzene, toluene, ethylbenzene, and xylene isomers in water using automated solid-phase microextraction-GC-FID

Article Abstract:

A protocol based on two dilutions, the first using acetone and the second using distilled water, can be used to analyze samples containing free-phase or high concentrations of benzene, toluene, ethylbenzene and the three xylene isomers (BTEX) with the automated solid-phase microextraction-gas chromatograph-flame ionization detector method. This is because environmental samples with free-phase or high concentrations of BTEX need to be diluted prior to analysis. Accurate quantification can be achieved by diluting high concentration BTEX samples below the aqueous solubility indicated by Raoult's law.

Benzene, Toluene, Xylene, Xylenes, Ethylbenzene

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Optimization of an aerobic polishing stage to complete the anaerobic treatment of munitions-contaminated soils

Article Abstract:

Compounds such as 2,4,6-trinitrotoluene (TNT) and an herbicide called Dinoseb (2-sec-butyl-3,4-dinitro-o-cresol) are pollutants found in soil at facilities where munitions are produced and disposed. A new remediation approach to remove these soil contaminants requires anaerobic conditions which are achieved thru the addition of an external carbon source to the soil such as acetate, soluble starch and glucose. Excess carbon is removed by the addition of an aerobic stage after the anaerobic stage. A second aerobic stage is also added to remove the excess oxygen left in the soil.

Environmental aspects, Soil disinfection, Weapons industry

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Abiotic nitrate reduction to ammonium: key role of green rust

Article Abstract:

The ability of iron(II) to reduce nitrate to ammonia in alkaline solutions suggests the potential of greenish iron hydroxides, also known as green rust (GR) compounds, in bioremediation of soils. Previous data on the nature and mechanism of action of GR show that it is formed from the partial oxidation of Fe(II) solutions and is structurally similar to pyroaurite. GR is found in non-acid, Fe(II)-containing soils and sediments.

Research, Oxidation-reduction reaction, Oxidation-reduction reactions, Soils, Nitrates, Soil leaching

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