Publication date: October 2015
Source:Geoderma, Volumes 255–256
Author(s): Yun-Bin Jiang , Huan Deng , Dong-Mei Sun , Wen-Hui Zhong
We aimed to determine if electrical signals generated by soil microorganisms in microbial fuel cells (MFCs) can accurately respond to Cd2+ concentrations and to evaluate the linear detection range of the method. MFCs were packed with soil spiked with 10 to 400C ) and start-up time (ST ) of the MFCs were calculated as electrical signals. The dehydrogenase activity (DHA) of the Cd2+-spiked soil was determined as a reference method. After MFC operation, the diversity of anodic bacteria was studied by using PCR-DGGE and the sequencing of 16S rRNA genes. The results showed that with increasing Cd2+ concentration, C decreased while ST increased significantly. In the control, C was 30.86ST was 14.39C (r2 P ST (r2 P Bacillus , Comamonas , Clostridium and Enterobacter . We propose that electrical signals can be used to evaluate the toxicity of Cd2+ to soil microorganisms at concentrations below 100
Source:Geoderma, Volumes 255–256
Author(s): Yun-Bin Jiang , Huan Deng , Dong-Mei Sun , Wen-Hui Zhong