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Cited by 263

The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.

Influence of Organic Ligands on Chromium(VI) Reduction by Iron(II)

Buerge, Ignaz J., Hug, Stephan J.·1998·Environmental Science & Technology
DOI 10.1021/es970932b
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Abstract

Iron(II) is one of the most important reductants that transforms toxic chromium(VI) to essentially nontoxic chromium(III), but the effect of iron speciation on this redox reaction is not well-understood. We determined rate constants for Cr(VI) reduction by a series of Fe(II)−organic complexes, using UV−vis spectroscopy and kinetic fitting. The experiments with 1−20 μM Cr(VI), 1−60 μM Fe(II), and 5−1000 μM organic ligand at pH 4.0−5.5 can be described with the following rate law: −d[Cr(VI)]/d t = ∑ L k L [Fe(II)L][Cr(VI)], where k L is pH-dependent. Fe(III)-stabilizing ligands such as bi- and multidentate carboxylates and phenolates generally accelerate the reaction, whereas Fe(II)-stabilizing ligands such as phenanthroline essentially stop the reaction. The rate coefficients increase with decreasing electron reduction potential of the Fe(III)L−Fe(II)L redox couples. The relationship of log k L versus E H °(Fe(III)L) is quite linear over 10 orders of magnitude. Dissolved organic matter extracted from the organic horizon of a forested spodosol shows qualitatively the same behavior as the investigated carboxylates. The presence of organic ligands leads to soluble Cr(III) and Fe(III) complexes. These results are important in DOC-rich soils and natural waters with respect to Cr(VI) reduction rates, the mobility of the products, and the reoxidation probability of newly reduced Cr(III), e.g., by naturally occurring manganese oxides.

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Metadata

Authors
Buerge, I. J., & Hug, S. J.
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
1998-06-02
Volume
32
Issue
14
Pages
2092-2099
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
DOI
10.1021/es970932b
OpenAlex
W2077597995
Cited by
263
References
31
FWCI
3.42
Type
journal article
Language
en
Open access
closed

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