Fe, Al, Mn, and S chemistry of Sphagnum peat in four peatlands with different metal and sulfur input

摘要: Comparisons among 4 peatland sites representing a gradient of increasing Fe, Al, Mn, and S loading revealed significant accumulation total S, but not in surface (0 to 20 cm deep) peat along the gradient. Iron Al were contributed mainly by organically bound fractions, with oxides contributing lesser extent. Although SO4 2− Fe sulfides showed increases concentration gradient, most was organic, rather than inorganic S. Laboratory studies Fe2+ adsorption indicated that pH added solutions (pH values 3, 4, 5, 6) did significantly affect Langmuir equation estimates either maximum capacity or affinity for Fe2+. Regardless solutions, final solution relatively uniform, averaging about 3.4, reflecting considerable bufferring Sphagnum peat. Factors affecting metals remain topics further investigation.