Products of chromate reduction on proposed subsurface remediation material

Article Abstract:

The outermost edges of iron filings used in the subsurface remediation of dissolved chromate developed geothite and chromium coatings. The iron filings were mixed with quartz and immersed in solutions that contained about 20 mg/L dissolved Cr(VI). The use of iron filings and quartz grains in chromate reduction is important in determining the fate of reduced chromium for the proposed use of permeable-reactive redox walls. Subsequent analysis of the iron filings' surface indicate that Cr(VI) can be completely reduced to Cr(III).

Research and Development in the Physical, Engineering, and Life Sciences, Electronic components, not elsewhere classified, Iron ores, Iron Ore, Iron Ore Mining, All Other Miscellaneous Nonmetallic Mineral Product Manufacturing, Water Pollution Control R&D, Quartz Crystals, Water pollution, Iron, Iron (Metal), Water pollution research, Quartz

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Response to comment on "redox interactions of Cr(Vi) and substituted phenols: products and mechanism

Article Abstract:

The suggestion that the rapid formation of a chromate-phenol ester is the first step in the oxidation of phenols by chromate is supported by the UV/visible difference spectra showing absorbance bands in the 350-450 nm region. The inconsistencies in the absorbance bands is due to the different spectrophotometers used. Diode array spectrometers are not as sensitive as scanning spectrophotometers in producing an accurate spectral identification of chromate-phenol esters.

Analytical Laboratory Instrument Manufacturing, Analytical instruments, Phenol & Derivatives, Ultraviolet Spectrophotometers, Evaluation, Phenols, Phenols (Class of compounds), Oxidation-reduction reaction, Oxidation-reduction reactions, Aromatic alcohols, Spectrophotometer, Spectrophotometers

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Trapping of Cr by formation of ferrihydrite during the reduction of chromate ions by Fe(II)-Fe(III) hydroxysalt green rusts

Article Abstract:

Researchers from France evaluated the potential of Fe(II)-Fe(III) hydroxysalt green rusts to reduce hexavalent chromium from CR(VI) to CR(III).

France, Science & research, Salts of Aromatic Acids, Brief Article, Aromatic compounds, Organic salts

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