In order to study the adsorption behavior of lead in sediment and soil

the adsorption of Pb adsorption in sediment and soil were investigated by batch equilibrium studies according to OECD guideline 106

and the influence of the pH

organic matter and N

P concentration on adsorption process were also discussed in this study. The results showed that the adsorption isotherm of Pb was well fitted with the Temkin equation in the soil

the correlation constant were 0.925; the adsorption isotherm of Pb was well fitted with the Freundlich equation in the soil

the correlation constant were 0.971. Study showed that

Pb under the adsorption condition of 15

25 and 35℃

with the increase of temperature

the adsorption of Pb in sediment and soil would be strengthened

ΔG＜0

ΔH＞0

revealed that the adsorption of Pb in the sediment and soil was a spontaneously endothermic process. Study showed that

under the pH condition of 3～11

the Pb adsorption quantity increased with the increase of pH

after the first increased and then to be gentled. When the pH was equal to 5

the adsorption effect was best. After removal of the organic matter the adsorption amount of Pb in sediment and soil decreased by 121.6

87.4 mg/kg

respectively. With the increase of N

P

the adsorption amount of Pb in sediment and soil decreased

which might be due to with the carrying of N

P

the K+ was added

and it had a competitive adsorption of Pb led to reducing adsorption capacity of Pb.