Iron oxidation kinetics in an acidic alpine lake

R.C Barry; J.L Schnoor; B Sulzberger; L Sigg; W Stumm

doi:10.1016/0043-1354(94)90270-4

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Iron oxidation kinetics in an acidic alpine lake

Journal article

Peer reviewed

Iron oxidation kinetics in an acidic alpine lake

R.C Barry, J.L Schnoor, B Sulzberger, L Sigg and W Stumm

Water research (Oxford), Vol.28(2), pp.323-333

1994

DOI: 10.1016/0043-1354(94)90270-4

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Abstract

Four experiments were performed to assess the role of homogeneous, heterogeneous, biological and photochemical processes in the oxygenation of ferrous iron in aquatic ecosystems. Experiments were carried out at Lake Cristallina, Ticino, Switzerland, and in the laboratory. Rate constants are presented for homogeneous oxygenation in lakewater, for oxygenation by lake sediment under sterile and non-sterile conditions and for heterogeneous oxygenation in the presence of TiO 2, MnO 2, Fe 2O 3, Al 2O 3 and SiO 2. It was found that, on a surface area adjusted basis, TiO 2, MnO 2 and Fe 2O 3 were three orders of magnitude more effective in accelerating oxygenation than Al 2O 3 and SiO 2, suggesting that these minerals form strong, inner sphere complexes with Fe(II) in the pH range 4–6. Sterilization by gamma irradiation reduced oxygenation rate in the presence of lake sediment by two orders of magnitude on a surface area adjusted basis. Oxygenation in the presence of 0.44 μm filtered lakewater was not appreciably different from that in distilled water. In situ experiments showed that oxygenation rate increased in the presence of sunlight. The heterogeneous rate constant for iron oxidation with lake sediment was 4.9 × 10 14 M −2 atm −1 s −1 m −2 and with pure minerals ranged from 1.8 × 10 10 to 5.3 × 10 13 M −2 atm −1 s −1 m −2.

acidic lake

biogeochemistry of iron

heterogeneous catalysis

iron(II) oxidation

Details

Title: Subtitle: Iron oxidation kinetics in an acidic alpine lake
Creators: R.C Barry - Department of Civil and Environmental Engineering, The University of Iowa, Iowa City, IA 52242, U.S.A
J.L Schnoor
B Sulzberger - Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), CH-8600 Dübendorf, Switzerland
L Sigg - Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), CH-8600 Dübendorf, Switzerland
W Stumm
Resource Type: Journal article
Publication Details: Water research (Oxford), Vol.28(2), pp.323-333
Publisher: Elsevier Ltd
DOI: 10.1016/0043-1354(94)90270-4
ISSN: 0043-1354
eISSN: 1879-2448
Language: English
Date published: 1994
Academic Unit: Occupational and Environmental Health; Civil and Environmental Engineering
Record Identifier: 9983997430902771

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