Соелма Батожаргаловна Сосорова The authors studied sorption properties of the alluvial light-humus soil (Republic of Buryatia) relative to lead under static conditions. The paper presents determined parameters and kinetics of lead sorption from aqueous solutions of lead nitrate by soil. A series of soil suspensions were used in the experiment, from which aliquots were taken at fixed intervals (30-1440 minutes) to determine the residual concentration of lead ions with atomic emission spectroscopy. The experimental data were processed using the Langmur and Freundlich equations. Such sorption parameters as A max , K L , K p 1/n, R 2 , ∆G, S of specific surface were calculated relative to lead ions. It is shown that the A max of the studied soil is 100.6 mmol • kg -1 in the studied concentration range. It has been established that about 99% of lead ions are absorbed by the soil in the first 3 hours and the adsorption equilibrium in the lead-soil system is mainly reached in 3-24 hours, depending on the initial lead concentration. The kinetics of lead ion sorption by the soil under study is satisfactorily described by a pseudo-second order model. This leads to a conclusion that the sorption of lead ions is limited by the stage of chemical reaction.
Научная статья 
Fluvisols Eutric (FLeu)