Precipitation mediated by strain YN23 of Metallosphaera sedula
10.3969/j.issn.1673-6273.2007.04.001
- VernacularTitle:YN23菌株作用下的铁矾沉淀
- Author:
Jian-Nan DING
1
;
Jian GAO
;
Jian KANG
;
Xue-Ling WU
;
Guan-Zhou QIU
Author Information
1. 中南大学
- Keywords:
strain YN23;
Metallosphaera sedula;
precipitation;
iarosite;
ammonioiarosite
- From:
Progress in Modern Biomedicine
2007;7(4):481-485
- CountryChina
- Language:Chinese
-
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 resouTce under optimal condidons (pH1.5，65℃,0.2g·1-1 yeast extract,30g·1-1 Fe2SO4·7H2O and 170rpm)．XRD，EDS，ETIR 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.
