浸矿细菌抗镉性能的试验研究

Cadmium-Resistance of Ore Bioleaching Bacteria

通过在培养基中加入一定浓度的镉离子,确定浸矿细菌对镉离子的抗性以及镉对浸矿细菌生长的影响.研究表明:不同浓度的镉离子对细菌的生长和活性起不同的作用.菌液中镉离子浓度低于0.1 mmol/L时,镉离子是浸矿细菌的营养物质,对细菌的生长起促进作用;随着镉离子浓度的增高,对细菌的生长起一定的抑制作用.浸矿细菌表现出良好的抗镉能力,镉离子浓度在高达8 mmol/L时,浸矿细菌仍然生长,保持好的活性.菌液中镉离子浓度为10 mmol/L时,浸矿细菌的生长受到影响.

Cadmium ions were added into the culture medium to make certain the cadmiumresistance of ore bioleaching bacteria and the influence of cadmium ions on their growth. The results showed that different concentrations of cadmium ions affect differently the growth and activity of the bacteria. If the concentration in the liquid medium is lower than 0.1 mmol/L, it is nutrient to the strain we selected and expedites its growth, whereas the further increasing concentration will inhibit its growth. Ore bioleaching bacteria have a good ability to resist cadmium and they remain growing with high activity kept on even if the concentration of cadmium ions is up to 8 mmol/L. However, if the concentration is 10 mmol/L, the growth of ore bioleaching bacteria will be inhibited.