摘要
铁的生物地球化学循环过程具有特殊的环境效应,铁还原菌在铁循环过程中扮演了十分重要的角色。选取9种常见的天然和合成的有机电子介体(包括低分子量的醌类、腐植酸和富里酸)研究了其对3种铁还原菌(L17、S12和HS01)还原针铁矿(α-FeOOH)的影响。结果表明,在不添加外源性电子介体的条件下,3种铁还原菌都能够还原针铁矿;而外源性电子介体的加入能加快针铁矿的生物还原;电子介体的电子穿梭效应与其氧化还原电位很具有一定的联系。此外,电子介体的电子穿梭效应与其电子接受容量(electron acceptor capacity,EAC)存在明显的线性关系。
The biogeochemistry of Fe has special environmental effects.Iron-reducing bacteria（IRB）play an important role in the Fe cycling.The effects of 9electron shuttles（including low-molecular-weight quinones,humic acid and fulic acid）on the bioreduction of goethite（α-FeOOH）by three strains of iron-reducing bacteria（Klebsiella pneumoniae L17,Aeromonas hydrophila HS01 and Shewanella decolorationis S12）were investigated.Although all of the iron-reducing bacteria used were able to reduce goethite in the absence of exogenous electron shuttles,the addition of exogenous electron shuttles enhanced the bioreduction of goethite.In general,the rate of Fe（II）production correlated with the concentration,redox potentials and EACs（electron acceptor capacity,EAC）of the electron shuttles.Notablely,there was a significant linear relationship between the rate of Fe（II）production and the EAC of electron shuttles.
出处
《常州大学学报（自然科学版）》
CAS
2016年第6期86-94,共9页
Journal of Changzhou University：Natural Science Edition
基金
国家自然科学基金青年基金(41301330)
江苏省自然科学基金(BK20130253)
江苏省产学研前瞻性联合研究项目(BY2015027-05)
关键词
电子介体
铁还原菌
电子接受容量
二价铁
electron shuttle
iron-reducing bacteria
electron acceptor capacity
ferrous iron
