Fig. 4

Luminescent bacterial acute toxicity of sediment pore water. a Inhibition ratio of 5 raw sediment pore water (SDPW) samples on luminescent bacteria 502; b inhibition ratio of diluted SDPW sample from site 1 on luminescent bacteria 502. NC negative control. Data are given as means of 3 replicates ± SD. Different letters on each column indicate significant differences at P < 0.05, the regression curves (black lines) are shown with their 95% confidence intervals (dashed lines), in which the top and bottom of the curve were set to 0% and 100%, respectively