Kinetics of Competitive Reduction of Nitrate and Iron Oxides by Aeromonas hydrophila HS01
文献类型： 外文期刊
作者： Liu, Tongxu 1 ; Zhang, Wei 1 ; Li, Xiaomin 1 ; Li, Fangbai 1 ; Zhang, Wei 1 ; Shen, Weijun 2 ;
作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China
期刊名称：SOIL SCIENCE SOCIETY OF AMERICA JOURNAL （ 影响因子：2.307； 五年影响因子：2.832 ）
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收录情况： SCI
摘要： While the interaction between NO3- and Fe reduction is well reported, it still lacks a detailed quantitative analysis of the properties and reactions responsible for the competitive reduction. In this study, the kinetics of the reduction of NO3- and Fe oxides by Aeromonas hydrophila HS01 were investigated in an artificial groundwater medium. The presence of Fe oxides showed an inhibitory effect on NO3- reduction to a varying extent, and vice versa, which was also evidenced by cyclic voltammetry analysis of Fe(II)/Fe(III). Higher Fe(III) availability and increased Fe oxide surface areas were more favorable for Fe reduction but resulted in a stronger inhibitory effect on NO3- reduction. The inhibitory effect also decreased with increased hematite crystallinity. Based on the kinetics and the elementary reactions, we established a kinetic model suggesting that direct biotic NO3- reduction by HS01 is the leading contribution, while the cell-associated Fe(II) produced by HS01 also reduced NO3- but with a limited contribution because the reaction rates of NO3 reduction by cell-associated Fe(II) are lower than that of NO3 reduction by HS01. This detailed kinetics and modeling study provides useful information for understanding the interaction between NO3- and Fe reduction in various subsurface environments.
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