| Agar plate method has been used to observe toxic ity of Hg, Cd, Pb, As, Cr. phenol and cyanide toward the indicating bacteria E.coli. The result is that sensitivity of E. culi to the seven chemicals is Hg> Cd> Pb > As>Cr and the inhibition zones of phenol and cyanide have not been seen. E.coli used as a kind of indicating bacteria to detect industrial sewage is suitable for the sewage containing metals.Analysis of regression is taken with the concentrations of Hg, Cd, Pb and As to each mean diameter of inhibition zone, and each correlation coefficient has high significant level, the regression slopes are As > Cd> Hg>PbThe analysis of regression may provide evidence for further reserch. |
