Reductive dissolution of goethite by phenolic reductants

Details Reductive dissolution of goethite by phenolic reductants Reductive dissolution of goethite by phenolic reductants

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..961l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 5, pp.961-971

Physics

10

Scientific paper

The reductive dissolution of goethite ( -FeOOH) and hematite ( -Fe 2 O 3 ) by phenolic reductants has been examined in order to improve the understanding of iron transformations in soils, sediments and aquifers. Rates of goethite reductive dissolution by hydroquinone increased as the pH was increased from pH 1.8 to 4.65, arid the following reaction stoichiometry was obeyed: 2 - FeOOH + QH 2 = 2 Fe 2+ + Q + 4 OH - . As the pH was increased from pH 4.5 to 6.0, the reductive dissolution rate decreased to below the detection limit. At pH 3.4, the reductive dissolution of hematite was two orders of magnitude slower than goethite. The relationship between structure and reactivity was examined for a series of mono-, di-, and tri-hydroxybenzene reductants. Rates of reductive dissolution decreased in the following order: catechol ~- hydroquinone > 3,4-dihydroxybenzoic acid > resorcinol-phenol-4-hydroxybenzoic acid.

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