Effects of Ca~(2+) ionic strength on sorption of polycyclic aromatic hydrocarbons (PAHs) on soils and sediments in Yellow River Delta

Influence of Ca2+ ionic strength for polycyclic aromatic hydrocarbons (PAHs) sorption on surface sediment and wetland soil from in Yellow River Delta was studied. The results indicate that adsorption capacity (KD) and velocity of soil and sediment de- crease with increase of Ca2+ ionic strength. 48 h sorption isotherms of soils and sediments are linear under different Ca2+ strength, and can be well fitted to Linear equation (R20.98). When adsorptions of PAHs are equilibrium, adsorption capacity (KD) of phenan- threne is 24~130 mL·g-1, that of Benzo[a]pyrene is 3 517~5 081 mL·g-1. Influences of Ca2+ strength on sorption of PAHs are differ- ence between soil and sediment samples. The disparity of adsorption capacity (KD) of soil and sediment shows effect degree of Ca2+strength on soil is more than sediments.