Abiotic nitrate reduction to ammonium: Key role of green rust

被引:301
作者
Hansen, HCB
Koch, CB
NanckeKrogh, H
Borggaard, OK
Sorensen, J
机构
[1] TECH UNIV DENMARK,DEPT PHYS,DK-2800 LYNGBY,DENMARK
[2] ROYAL VET & AGR UNIV,DEPT ECOL & MOLEC BIOL,MICROBIOL SECT,DK-1958 FREDERIKSBERG C,DENMARK
关键词
D O I
10.1021/es950844w
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Leaching of nitrate from soils and sediments can be reduced in anoxic environments due to denitrification to N2O/N-2 Or reduction Of nitrate to ammonium. While microbial dissimilatory reduction of nitrate to ammonia is well known, it is shown here that this conversion can also proceed at appreciable rates in abiotic systems in the presence of green rust compounds [(Fe4Fe2III)-Fe-II(OH)(12)SO4 . yH(2)O]. In the reaction nitrate is stoichiometrically reduced to ammonium, and magnetite (Fe3O4) is the sole Fe-containing product. At a constant pH of approximately 8.25 and 25 degrees C, the rate expression is given as: d[NH4+]/dt = k[Fe(II)](GR)[NO3-], where k = 4.93 x 10(-5) +/- 0.39 x 10(-5) L mol(-1) s(-1). In anoxic soils and sediments, this reaction may also lead to a nitrate to ammonium reduction, at rates of similar magnitude or even higher than microbial reduction rates. Hence green rust should be considered a possible important reductant for nitrate reduction to ammonium in subsoils, sediments, or aquifers where microbially mediated reduction rates are small.
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页码:2053 / 2056
页数:4
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