ABSTRACT
Iron oxides are ubiquitous reactive constituents of soils, sediments and aquifers. Under suboxic conditions, they serve as terminal electron acceptor for iron reducing bacteria. Chemical extraction techniques are often used to describe iron oxide distribution and reactivity in soils and sediments, and the literature on the subject is voluminous (Chao & Zhou 1983; Canfield 1988). Extraction methods, however, are empirically defined and not mineral specific (Borggaard 1988).
