Siderophore-manganese(III) interactions II. Manganite dissolution promoted by desferrioxamine B

被引:106
作者
Duckworth, OW [1 ]
Sposito, G [1 ]
机构
[1] Univ Calif Berkeley, Div Ecosyst Sci, Berkeley, CA 94720 USA
关键词
D O I
10.1021/es050276c
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Recent laboratory and field studies suggest that Mn(III) forms persistent aqueous complexes with high-affinity ligands. Aqueous Mn(Ill) species thus may play a significant but largely unexplored role in biogeochemical processes. One formation mechanism for these species is the dissolution of Mn(Ill)-bearing minerals. To investigate this mechanism, we measured the steady-state dissolution rates of manganite (gamma-MnOOH) in the presence of desferrioxamine B (DFOB), a common trihydroxamate siderophore. We find that DFOB dissolves manganite by both reductive and nonreductive reaction pathways. For PH > 6.5, a nonreductive ligand-promoted reaction is the dominant dissolution pathway, with a steady-state dissolution rate proportional to the surface concentration of DFOB. In the absence of reductants, the aqueous Mn(III)HDFOB+ complex resulting from dissolution is stable for at least several weeks at circumneutral to alkaline PH and at 25 degrees C. For PH < 6.5, Mn2+ is the dominant aqueous species resulting from manganite dissolution, implicating a reductive dissolution pathway. These results have important implications for the biogeochemical cycling of both manganese and siderophores-as well as Fe(III)-in natural waters and soils.
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页码:6045 / 6051
页数:7
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