LIU Chang-hong, JIN Liang, XUE Ya-rong
School of Life Science, Nanjing University, Nanjing210093
Abstract: Sulfate reduction bacteria(SRB)play important roles in metal bioremediations of soil and water. A strain of SRB,which had been identified to be Bacillus sp.Cr23,was isolated from a coastal intertidal soil using a selective medium,and was studied in detail for its Cr6+-reduction efficiency and its optimal culture conditions. Results showed that strain Cr23has as strong Cr6+tolerance as up to 600mg/L and as high Cr6+ -reduction rate as up to 75% at the concentration of 300mg/L. Moreover,the carbon and nitrogen sources as well as the pH of the media showed significant effects on the Cr6+ -reduction rate of strain Cr23;sodium acetate,sodium citrate and sodium nitrate were positively correlated with the reduction rate. The preliminary result indicated that the strain Cr23has strong environmental adaptability and high Cr6+reduction capacity in the remediation of metal contaminated soil and water ecosystems.
Key words: Cr6+;Bacillus sp.Cr23;Cr6+-reduction
*Corresponding Author, E-Mail: chliu@nju.edu.cn
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 30, No.3, 2011, page 65-269
(Source from http://www.cnki.com.cn/)
