Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments

被引：17
|
作者：
Gibney, Brian P. [1 ]
Nusslein, Klaus [1 ]
机构：
[1] Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA
来源：
CHEMOSPHERE | 2007年 / 70卷 / 02期
关键词：
arsenic sequestration; nitrate reduction; iron oxidation; microbial community; biogeochemistry;
D O I：
10.1016/j.chemosphere.2007.05.094
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus Dechloromonas in 16S rDNA clone libraries. Published by Elsevier Ltd.
引用
收藏
页码：329 / 336
页数：8
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