Dissolution of tetragonal ferrous sulfide (mackinawite) in anoxic aqueous systems. 2. Implications for the cycling of iron, sulfur, and trace metals

Both nonoxidative and oxidative mechanisms can play important roles in determining how FeS and associated trace metals are solubilized under different environmental conditions. Models are presented for determining the FeS concentration profiles in anoxic sediments experiencing FeS dissolution. Methods for calculating the time required to completely dissolve suspended FeS particles of various sizes in anoxic waters are also presented. The relative rates of oxidative and nonoxidative FeS dissolution are discussed with respect to trace metal release from sewage sludge and sediments and pyritization in sediments