Abbau von Eisen(III)‐citrat in durchlüfteter wäßriger Lösung durch Bodenbakterien

Abstract

Decomposition of iron(III)‐citrate in a well‐aerated, aqueous solution by soil bacteriaThe decomposition of iron(III)‐citrate by soil bacteria in a well‐aerated NH₄‐mineral salt solution at constant pH‐values between 3.3 and 8.5 resulted in a yellow (at low pH) or brown precipitate, respectively. The iron(III)‐precipitate is amorphous to X‐rays, contains approximately 12% carbon and about 40% iron (Fe). The freeze‐dried product is dissolved completely in an acid solution of ammonium oxalate.Bacteria, capable of decomposing ammonium iron(III)‐citrate, were isolated by plate method and identified by morphological and physiological studies. They could be separated into two groups: The first group contained strains classified as Pseudomonas fluorescens, whereas members of the second group could be assigned to the new genus Acinetobacter.