Heavy metal resistance of two Acidithiobacillus ferrooxidans strains

摘要：

The viability of microbe can be enhanced by their heavy metal resistances in adverse surroundings, which are universal in bioleaching process. In this investigation, the heavy metal resistances of two Acidithiobacillus ferrooxidans (At.ferrooxidans) strains were determined. The two At. ferrooxidans strains, named DY26 and DC, were isolated from acid mine drainages at two major copper mines in China. Cu 2+ , Zn 2+ , Cd2 + , Pb2 + and Ag+ were used to simulate adverse surroundings for the resistances experiment. DY26 strain had corresponding heavy metal-tolerance levels of 0. 04 mol/L, 0. 35 mol/L, 0. 04 mol/L, 0. 005 mol/L and 5 x 10-7mol/L, whereas DC strain had corresponding heavy metal-tolerance levels of 0. 22 mol/L, 0. 36 mol/L, 0. 26 mol/L, 0. 005 mol/L and 1 x 10 -6mol/L. Results showed that the heavy metal-tolerance levels in both DY26 strain and DC strain followed the order of Zn2 + > Cd2 + > Cu2 + > Pb2 + > Ag+ . And it was indicated that the heavy metal-tolerance levels of Cu + , Cd2 + and Ag+ in DY26 strain were higher than that in DC strain. However, the zinc-tolerance level and the leadtolerance level almost had no difference respectively in DY26 strain and DC strain.

关键词： Acidithiobacillus ferrooxidans heavy metal resistance K2Cr2O7 titration method

作者: Qi Hu Xueling Wu Huaqun Yin Xueduan Liu

作者单位: School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China

会议类型: 国际会议

会议名称: The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)

会议地点: 长沙

会议语种:英文

页码: 118-122

在线出版日期: 2011-09-18（万方平台首次上网日期，不代表论文的发表时间）