Pekka Lähdesmäki

Humushapot edistävat mikrobiaalista rautasaostumien muodostumista suovesissa

Lähdesmäki P. Humushapot edistävat mikrobiaalista rautasaostumien muodostumista suovesissa.

Tiivistelmä

Humic acids and certain thiobacilli and blue-green algae (Beggiatoa and Oscillatoria species) found in peat water stimulated the precipitation of oxidized iron products both in natural water and in laboratory cultures. The complex Fe (II)/Fe (III) humates had a considerably lower redox potential than Fe (II)/Fe (III) sulphate (488 vs. 782 mV at pH 2.0, 25 °C). Oxygen consumption in excess of the endogenous rate occurring during the oxidation of Fe (II) to Fe (III) was significantly higher in the presence of humic acids and pyrophosphates than in that of sulphates and oxalates, for instance. The presence of microorganisms and high amounts of humic acids in some natural water samples may be the main reason for the iron precipitation, since no other significant differences could be observed between water containing high or low amounts of ferruginous iron oxidate deposits.

Vastaanotettu 31.10.2017 Julkaistu 1.1.1984

Katselukerrat 1864

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