Abstract
INTRODUCTION Clay minerals, the main constituents of most marine sediments, play a fundamental role in organic matter preservation, due to their high surface area and strong adsorption capability (Bock and Mayer, 2000). Indeed, adsorbed organic matter can aggregate clay particles and result in the formation of organic-mineral complex (Arnarson and Keil, 2001), which protects the organic matter from further microbial degradation (Yu et al., 2009). However, dissimilatory iron reducing bacteria (DIRB) as well as sulfate reducing bacteria (SRB) can re-mobilize the structural ferric iron in clay minerals and partly lead to release of adsorbed organic matters (Dong et al., 2009; Zhang et al., 2007; Li et al., 2004). Therefore, the geochemical iron cycle in clay minerals can impact the fate of adsorbed organic matter. In this study the reduction extents of Fe(III) in clay minerals by DIRB Shewanella putrefaciens and
Published Version
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