Precipitation mediated by strain YN23 of Metallosphaera sedula
Author(s): DING Jiannan, GAO Jian, KANG Jian, WU Xueling, QIU Guanzhou
Pages: 481-485
Year: 2007 Issue: 4
Journal: Biomagnetism
Keyword: strain YN23; Metallosphaera sedula; precipitation; jarosite; ammoniojarosite;
Abstract: To have a better understanding on the evolution of Metallosphaera sedula-mediated precipitation and the properties of the precipitate synthesized by this species,a newly identified extremely thermophilic strain(YN23)of Metallosphaera sedula was cultured in the medium containing Fe2+ as energy resource under optimal conditions(pH1.5,65℃,0.2g·1-1 yeast extract, 30g·1-1 Fe2SO4·7H2O and 170rpm).XRD,EDS,FTIR and SEM reveal the precipitate obtained from YN23-inoculated flasks to be a mixture of potassium jarosite and ammoniojarosite,with morphological features similar to the latter.Precipitation was first detected once over 90% of Fe2+ was oxidized at hour 25 with a peak pH value of 1.92,and was ended when precipitate reached the highest point of 7.9g·1-1 at hour 95 with the lowest pH value of 1.32 in solution.Microbial density underwent a rapid increase along with Fe2+ oxidation and a gradual decrease with precipitate piling up.
Pages: 481-485
Year: 2007 Issue: 4
Journal: Biomagnetism
Keyword: strain YN23; Metallosphaera sedula; precipitation; jarosite; ammoniojarosite;
Abstract: To have a better understanding on the evolution of Metallosphaera sedula-mediated precipitation and the properties of the precipitate synthesized by this species,a newly identified extremely thermophilic strain(YN23)of Metallosphaera sedula was cultured in the medium containing Fe2+ as energy resource under optimal conditions(pH1.5,65℃,0.2g·1-1 yeast extract, 30g·1-1 Fe2SO4·7H2O and 170rpm).XRD,EDS,FTIR and SEM reveal the precipitate obtained from YN23-inoculated flasks to be a mixture of potassium jarosite and ammoniojarosite,with morphological features similar to the latter.Precipitation was first detected once over 90% of Fe2+ was oxidized at hour 25 with a peak pH value of 1.92,and was ended when precipitate reached the highest point of 7.9g·1-1 at hour 95 with the lowest pH value of 1.32 in solution.Microbial density underwent a rapid increase along with Fe2+ oxidation and a gradual decrease with precipitate piling up.
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