ORGANIC-MATTER MINERALIZATION WITH REDUCTION OF FERRIC IRON IN ANAEROBIC SEDIMENTS
ORGANIC-MATTER MINERALIZATION WITH REDUCTION OF FERRIC IRON IN ANAEROBIC SEDIMENTS
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DOI：
10.1128/aem.51.4.683-689.1986
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发表时间：
1986-04-01
影响因子：
4.4
通讯作者：
PHILLIPS, EJP
中科院分区：
文献类型：
--
作者：
LOVLEY, DR;PHILLIPS, EJP
以波托马克斯河口淡水和微咸水水域的沉积物为研究对象，研究了以可发酵底物、发酵产物和复合有机物为电子供体还原铁离子的可能性[美国]。在富含葡萄糖和赤铁矿的情况下，铁还原是电子流动的次要途径，发酵产物积累。用无定形氢氧化铁代替葡萄糖富集剂中的赤铁矿，可使铁还原能力提高50倍，因为发酵产物也可在伴随铁还原的情况下代谢。醋酸盐、氢、丙酸、丁酸盐、乙醇、甲醇和三甲胺促进了接种底泥的无定形氢氧化铁的还原。不同形态的铁对甲烷产生的抑制程度与这些铁化合物作为醋酸酯代谢的电子受体的有效性有关。醋酸盐或氢气的加入解除了铁离子对甲烷生成的抑制。添加无定形氢氧化铁的沉积物中甲烷电子当量的减少被亚铁中电子当量的相应增加所补偿。这些结果表明，铁还原可以在沉积物有机质方面胜过产甲烷食物链。因此，当厌氧沉积物中存在无定形氢氧化铁时，有机物中的电子向铁离子的转移可能是有机物分解的主要途径。
The potential for ferric iron reduction with fermentable substrates, fermentation products, and complex organic matter as electron donors was investigated with sediments from freshwater and brackish water sites in the Potomax River Estuary [USA]. In enrichments with glucose and hematite, iron reduction was a minor pathway for electron flow, and fermentation products accumulated. The substitution of amorphous ferric oxyhydroxide for hematite in glucose enrichments increased iron reduction 50-fold because the fermentation products could also be metabolized with concomitant iron reduction. Acetate, hydrogen, propionate, butyrate, ethanol, methanol, and trimethylamine stimulated the reduction of amorphous ferric oxyhydroxide in enrichments inoculated with sediments. The degree of inhibition of methane production by various forms of ferric iron was related to the effectiveness of these ferric compounds as electron acceptors for the metabolism of acetate. The addition of acetate or hydrogen relieved the inhibition of methane production by ferric iron. The decrease of electron equivalents proceeding to methane in sediments supplemented with amorphous ferric oxyhydroxides was compensated for by a corresponding increase of electron equivalents in ferrous iron. These results indicate that iron reduction can outcompete methanogenic food chains for sediment organic matter. Thus, when amorphous ferric oxyhydroxides are available in anaerobic sediments, the transfer of electrons from organic matter to ferric iron can be a major pathway for organic matter decomposition.