Bioavailability of Sheet Silicate Bound Ferric Iron

3 The Bioavailability of Sheet Silicate Bound Ferric Iron 

Experimental determination of reduction rates (e.g. Pyzik and Sommer 1981 Dos Santos Afonso and Stumm 1992 Peiffer et al. 1992) reveal rates under well defined conditions and information on the reaction kinetics. Under natural conditions the 

A sequence of iron mineral reactivity towards sulfide was proposed more than 10 years ago (Canfield et al. 1992), which was later extended (Raiswell and Canfield 1996), and recently revised (Poulton et al. 2004). The revised sequence particularly accounts for the mineral surface area and can be grouped into two fractions excluding 

0 minutes 12.3 hours 10.9 hours 63 days 72 days 182 years 10 000 years 

The reaction of dissolved Fe with oxygen is known to be fast and its rate was determined in sea-water by Millero et al. (1987)  

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