Abstract：In this study, secondary iron minerals was synthesized by A. ferrooxidans in the solution with 48 or 4.8mg/L magnesium ions and other elements in consistent with 9K liquid medium. pH, oxidation reduction potential, Fe2+ oxidation rate, total Fe precipitation rate, secondary iron minerals phase and mineral crystal size in two systems were investigated. pH in the treatment with 48or 4.8mg/L of magnesium ion decreased from 2.50at 0h to 2.30or 2.19at 48h, whereas ORP increased from 259mV to 269mV or 276mV, respectively. Ferrous ions could be completely oxidized by A. ferrooxidans within 48h, secondary iron minerals morphology and total Fe precipitation rate, however, were different in two systems. With 48mg/L of magnesium ion, the total Fe precipitation rate was 23.7% after 48h reaction, while it rose to 32.2% in the presence of 4.8mg/L of magnesium ion. The precipitates formed in the two treatments were a mixture of jarosite and schwertmannite. However, unlike the precipitates closely adhered to the flask bottom in the treatment with 48mg/L of magnesium ion, the precipitates formed in the presence of 4.8mg/L of magnesium ion uniformly dispersed in the solution, and the crystal length (~1.60μm) of jarosite was 1.2times larger than it in the former.
刘奋武, 高诗颖, 王敏, 卜玉山, 崔春红, 周立祥. 镁离子对氧化亚铁硫杆菌生物合成次生铁矿物的影响[J]. 中国环境科学, 2014, 34(3): 713-719.
LIU Fen-Wu, GAO Shi-Ying, WANG Min, BU Yu-Shan, CUI Chun-Hong, ZHOU Li-Xiang. Effect of magnesium ions on the formation of secondary iron minerals facilitated by Acidithiobacillus ferrooxidans. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(3): 713-719.
