Soil PH On Copper Bioavailability, Morphology, And Remediation Of Soil Pollution

Because of the growing soil acidification, the activation degree of aluminum ion and heavy metal ions in the soil is increased day by day. The risk that heavy metals join the food chain in the soil to plant is enhanced owing to the content of heavy metal ions increasing in the environment, In addition, the groundwater is polluted with the soil water infiltration when the concentration of heavy metal ions is increased. At present, The experiment rarely studies the morphological changes of the copper in the different soil and the bioavailability of the copper. Our study will provide the theoretical basis for the repair of contaminated soil and environmental risk assessment. This study focuses on the change of combination morphology of copper in the soil and the bioavailability of copper in the different acidification measures and different degree acidification of soil, and the morphological changes of copper and the effect on plants after adding the repairing agent (montmorillonite, kaolinite) in the soil.1 Removal of aqueous Cu (II) ion by nanoscale montmorillonite and kaolinnite under different pH valueThe ability and the mechanism of the nanoscale montmorillonite (MMT) and kaolinnite (Kao) adsorbing aqueous Cu (II) ions were investigated in this study,Langmuir and Freundlich isotherm equations had studied the sorption constants under different pH value in the solution. The results showed that the MMT and Kao can remove Cu (II) in the solution efficiently. The adsorption results indicated that the sorption affinity and sorption maximum on nano-MMT for Cu (II) were always higher than that of nano-Kao; the removal efficiency reached 99.5% and 94.3% respectively with the Cu (II) concentration less than 120 mg/L in the solution. Solution pH was an important parameter in controlling Cu ions sorption onto the MMT and Kao, the removal efficiency of the MMT and Kao decreased with increasing Cu (II) concentration in solution and decreasing pH in solution.2 Acidification of different measures (adding sulfuric acid solution, add ammonium sulfate and acid rain) on the effectiveness of copper in soilResearching on the copper effectiveness under different acidification treatments (adding acid solution and ammonium sulfate solution and simulation of soil acid), with the reduction of the pH, the copper′s exchange, except residue and bound to carbonate, copper bound to Fe-Mn oxides and organic matters both increased under three different acidification treatments, with the rising effective state of copper, the contents absorbed by plants also increased gradually, adding montmorillonite clay and kaolinite both can lessen the effectiveness of copper, which can promote the ability of copper's transformation from effective state to residue , and block the absorption of plant.The montmorillonite treatment simulated acid rain state, residue state rised more rapidly than another treaments under pH 6.0, and increased 28.22% compared with the control, The kaolin treatments is in the acid solutions, residue state rises more quickly than another treaments under pH 6.3, and increased 17.3% compared with the control, and the montmorillonite clay treatment is in the acid solutions, residue state rised more rapidly than another treaments under pH 6.0, and increased 12.4% compared with the control, the kaolin treatment is in the acid solutions, the residue state in kaolin treatment rised more rapidly than another treaments under pH 6.3, and increased 5.35% compared with the control.3 Adding different restoration agent on the effect of copper contaminated soil remediationAdd fix under different acidification agent (MMT, Kao) in pot experiment, the results showed that SOD activity increased with the decrease of pH, indicating that the pH of the plant by reducing the stress is also greater. The addition montmorillonite and kaolin, the plant stems and leaves, SOD activity decreased in varying degrees, add plants montmorillonite was greater than the decrease in SOD added kaolin. Shouguang add montmorillonite soil solution in the treatment of sulfate, pH6.6 level of SOD activity in MMT treatment significantly decreased the most, down 15.02 % compared with control, add the Kao in a simulated acid rain treatment, pH6. 6 levels of SOD activity decreased most significantly, decreased by 10.03 % compared to the control. Daye added montmorillonite soil solution in the treatment of sulfate, pH6.5 level of SOD activity decreased most significantly, decreased by 19.84 % compared with control, adding the kaolin in the next three measures are pH7.1 acidification level of SOD activity declined most significantly, reduced 14.78 % compared to the control.