Chen Hao, Chen Ling, Zhao Jian-Fu, Huang Ai-Qun
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Engineering, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue. 2007 Apr;28(4):786-90.
The influence of Ni2+, Cd2+ and Cu2+ on electron transport system (ETS) activity of anaerobic 2-chlorophenon degradation sludge, as well as the effect of acclimation on microbial resistance to metallic toxicity, was investigated. The inhibitive effect of heavy metals on ETS activities acted within 0.25 h, and metallic toxicity aggravated with the increasing amount of metallic ions. The relative strength of inhibition was Ni2+ > Cd2+ > Cu2+ and was mainly dependent on the metallic ion concentration in solution. Acclimation with metals of low concentration was proved to be a good way to improve the microbial resistance to heavy metals. After domestication, the toxicity of Cu2+ decreased 10%, and the maximum decreasing percentage of Cd2+ inhibition was more than 40%, while the effect of Ni2+ transferred to be in favor of ETS activity with the optimal concentration of 70 mg/L. The particularly active effect of Ni2+ was probably due to the capability of Ni2+ to form regular tetrahedron chelate compounds. The relative amelioration of microbial resistance was Ni2+ > Cd2+ > Cu2+.
研究了Ni2+、Cd2+和Cu2+对厌氧降解2-氯苯酚污泥电子传递系统（ETS）活性的影响，以及驯化对微生物抗金属毒性的作用。重金属对ETS活性的抑制作用在0.25小时内显现，且金属毒性随金属离子量的增加而加剧。抑制作用的相对强度为Ni2+>Cd2+>Cu2+，且主要取决于溶液中金属离子的浓度。事实证明，用低浓度金属驯化是提高微生物抗重金属能力的一种好方法。驯化后，Cu2+的毒性降低了10%，Cd2+抑制作用的最大降低百分比超过40%，而Ni2+在最佳浓度为70mg/L时对ETS活性产生促进作用。Ni2+的这种特殊活性作用可能是由于其形成规则四面体螯合物的能力。微生物抗性的相对改善程度为Ni2+>Cd2+>Cu2+。
