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还原脱氯,脱硫细菌Desulfovibrio dechloracetivorans strain SF3可异化还原三价铁,六价铬和三价钴.乙酸盐,乙醇,氢气,丙酮酸盐,乳酸盐和柠檬酸盐可作为还原可溶性三价铁的电子供体,而只有丙酮酸盐和氢气做电子供体时SF3才能还原不可溶的非晶态三价铁氧化物.实验测定Fe(Ⅲ)-EDTA还原对乙酸盐氧化的比例为7.76±0.35,而且该过程中没有伴随细菌的生长.SF3可利用氢气,丙酮酸盐或乳酸盐作为电子供体还原六价铬和三价钴,但这一过程不能利用乙酸盐作为电子供体.据我们所知,这是首次发现一种SRB(硫酸盐还原菌)可利用乙酸盐还原可溶性三价铁,但无法利用其还原不可溶三价铁以及六价铬和三价钴,该发现说明SF3在金属还原过程中利用了较复杂的电子传递系统.
Desulfovibrio dechloracetivorans strain SF3 can be dissimilatory in the reduction of ferric, hexavalent chromium and trivalent cobalt. Acetate, ethanol, hydrogen, pyruvate, lactate and citrate can be used as reducing trivalent Iron electron donor, and only pyruvate and hydrogen do electron donor when SF3 can reduce the insoluble amorphous ferric oxide.Experimental determination of Fe (Ⅲ) -EDTA reduction of acetate oxidation ratio of 7.76 ± 0.35, and bacterial growth is not accompanied by this process.SF3 can reduce hexavalent chromium and trivalent cobalt with hydrogen, pyruvate or lactate as electron donor, but this process can not utilize acetate as electron This is, for the first time, to our knowledge, an SRB (sulfate-reducing bacteria) that utilizes acetic acid to reduce soluble ferric iron but can not utilize it to reduce insoluble ferric and hexavalent chromium and trivalent cobalt This finding shows that SF3 utilizes a more complex electron transport system in the metal reduction process.