Addition of trace metals increases denitrification rate in closed marine systems
Addition of trace metals increases denitrification rate in closed marine systems
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DOI：
10.1016/s0043-1354(02)00383-4
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发表时间：
2003-02-01
期刊：
影响因子：
12.8
通讯作者：
Villemur, R
中科院分区：
文献类型：
--
作者：
Labbé, N;Parent, S;Villemur, R
我们调查了微量金属（铁，锰，铜，锌和钼）的反硝化单元在蒙特利尔生物圆顶的效果。从反硝化装置中提取微生物菌群，在250 mL恒化器中用人工海水进行培养，测定了5种微量金属离子的2个剂量。低剂量显示出反硝化速率增加20%，而高剂量具有更显著的效果，增加250%。没有观察到细菌生长的增加，表明微量金属对反硝化活性有影响。当单独测试微量金属时，只有铁具有与添加五种微量金属时观察到的反硝化速率增加类似的显著效果。与五种微量金属相比，Fe和Mn的组合引起了小但显著的增加。然后，我们测试了添加铁，锰和铜的反硝化单元在蒙特利尔生物圆顶的效果。高剂量的这些微量金属显示出250%的反硝化速率增加，从200到700克NOx-N/天。研究结果表明，微量金属元素的添加对反硝化活性有重要影响。(C)2002爱思唯尔科技有限公司版权所有。
We investigated the effect of trace metals (Fe, Mn, Cu, Zn and Mo) on the denitrification unit at the Montreal Biodome. Two dosages of the five trace metals were tested on a denitrifying bacterial population which was extracted from the denitrification unit and cultured in 250 mL chemostats with artificial seawater. The low dosage showed a 20% increase in the denitrification rate whereas the high dosage had a more pronounced effect with a 250% increase. No increase in bacterial growth was observed, suggesting that the trace metals had an effect on the denitrification activity. When the trace metals were tested separately, only iron had a significant effect similar to the increase in the denitrification rate observed when the five trace metals were added. The combination of Fe and Mn caused a small but significant increase compared to the five trace metals. We then tested the effect of adding Fe, Mn and Cu to the denitrification unit at the Montreal Biodome. A high dosage of these trace metals showed a 250% increase in the denitrification rate, which went from 200 to 700g NOx-N/d. Our results showed that the addition of trace metals is crucial for denitrification activities. (C) 2002 Elsevier Science Ltd. All rights reserved.