土壤中耐Cd^(2+)和Cu^(2+)微生物的分离及吸附特性的研究

Study on Screening Cd^(2+) and Cu^(2+) Tolerant Microbe and its Adsorption Characteristics

为了研究重金属污染的生物治理措施,采用马铃薯培养基从土壤中分离筛选获得了具有耐Cd2+和Cu2+菌株,对该目标菌株进行了形态学观察和生长特性的测定,采用原子吸收法测定了该菌株对Cd2+和Cu2+的吸附能力。结果表明:初步确定所获得的目标菌株属于酵母菌类,最适生长pH为8.5,最适生长温度为28℃。该目标菌株对Cd2+的最高耐受浓度为16mmol·L-1,对Cu2+的最高耐受浓度为4mmol·L-1。该目标菌株对Cd2+和Cu2+的最大吸附率和最佳吸附时间不同。

In order to study the biological treatment measures of heavy metal pollution,the resistance strain for Cd2＋ and Cu2＋ was separated from soil by using potato medium, and its characteristics,including the colony morphology,growth,adsorption to Cd2＋ ,Cu2＋ ,were measured. The results showed that the target strain was i- dentified as the yeast,the optimum growth pH was 8.5, the optimum growth temperature was 28℃. For the aim strain,the highest concentration of tolerance to Cd2＋ and Cuz＋ was at about 16 mmol-I.I , 4 mmolo L^-1 respectively. The target strain was different between the maximum adsorption rate and adsorption time for Cd2＋ and Cu2＋.