Abstract: The biosorption of Cd^２＋ and Pb^２＋ onto the dominant dead bacteria in the Yitong River and the effects of temperature, initial pH, initial metal ions and bacteria biomass on the biosorption were investigated. The results show that bacteria biomass had more influence on Pb^２＋ biosorption than on Cd^２＋ biosorption. The bacteria show the highest Pb^２＋ uptake capacities at an initial pH value of 4.5, and show the highest Cd^２＋ uptake capacities at an initial pH value of 6.0. The bacteria exhibited the highest Pb^２＋ and Cd^２＋ uptake capacities at 30 ℃. The concomitant Pb^２＋ had no considerable effect on the biosorption of Cd^２＋, and the concomitant Cd^２＋ had a considerable effect on the biosorption of Pb^２＋.

Key words: dominant bacteria, Cd^２＋, Pb^２＋, biosorption amount, concomitant metal ion