Dark oxidation of water in soils
Journal article, 2013

We report the release of oxygen (O-2) under dark conditions in aerobic soils. This unexpected process is hidden by respiration which constitutes the dominating reversal O-2 flux. By using (H2O)-O-18 in different soils, we confirmed that (OO)-O-16-O-18 and O-18(2) released under dark soil conditions originated from added (H2O)-O-18. Water is the only large-scale source of electrons for reduction of CO2 in soils, but it has not been considered as an electron donor because of the very strong oxidation system needed. A high share of soil inorganic material seems to favor the release of O-2.

soil CO2 reduction

soil respiration

dark water oxidation

soil oxygen release


S. Fleischer

Halmstad University

Lovisa Bauhn

Chalmers, Chemical and Biological Engineering, Nuclear Chemistry

Patrik Fors

Vattenfall Research and Development AB

Arvid Ödegård Jensen

Chalmers, Chemical and Biological Engineering, Nuclear Chemistry

Tellus, Series B: Chemical and Physical Meteorology

0280-6509 (ISSN) 1600-0889 (eISSN)

Vol. 65 1



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