摘要
The pH effect on the sorption kinetics of heavy metals in soils was studied using a Constant flow leaching method. The soil samples were red soil collected from Yingtan, Jiangxi, and yellow-browp soil from Nabing,Jiangsu. The heavy metals tested were zinc and cadmium.Assuming that the experimental data fitted to the following kinetic rate equation: 1/c dx/dt=kx∞-kx,the rate constant k of sorption could be determined from the slope of the straight line by plotting of 1/c.dx/dt vs. x. The results showed that the pH effect on the rate constants of heavy mental sorption in soils was very significant. The values of k decreased with inpeasing pH. The sorptions were more sensitive to pH in red soil than in yellow-brown soil.
The pH effect on the sorption kinetics of heavy metals in soils was studied using a constant flow leaching method.The soil samples were red soil collected from Yingtan,Jiangxi,and yellow-brown soil from Nanjing,Jiansu,The heavy metals tested were zinc and cadmium.Assuming that the experimental data diffed to the following kinetic rate equation:1/c.dx/dt=kx∞-kx,the rate constant k of sorption could be determined from the slope of the straight line by plotting of 1/c,dx/dt vs.x.The results showed that the pH effect on the rate constants of heavy mental sorption in soils was very significant.The values of k decreased with increasing pH.The sorptions were more sensitive to pH in red soil than in yellow-brown soil.
