pH Effect on Kinetics of Heavy Metal Sorption in SoilsEnglish Full Text
LIN YU-SUO and XUE JIA-HUA(Nanjing Institute of Environmental Scienpe, Notional Environmental Protection, Agency, Nanjing 210042China)(Nanjing Agricultural University, Nanjing 210014 China)
Abstract: 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.
Keywords：
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153.4
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