The influencing factors,including adsorption time,temperature and the pH value,were studied in adsorption test and co-adsorption test by cationic chitosan for lead ion and mercury ion.And adsorption equations were obtained on the basis of the optimum adsorption condition got from the adsorption tests.Results showed that the maximum adsorption capacity for mercury ion and lead ion were 1.31 and 1.14 mmol/g resp.when they existed separately,while the maximum adsorption capacity for mercury ion and lead ion we...