Chemical Stabilization Of Mercury Contaminated Soils

Mercury contamination in soils is increasingly under environmentalconcern, as a result of its high highly toxic, persistent and bioaccumulation.The principle of the chemical stabilization used in soil remediation is thatmercury contaminated in soils transform to the most stable compound in soils,by artificial means of chemical stabilizers. Chemical stabilization is widelyused for remediation of soils due to chemical reactions and physical reactions.In this paper, Mercury in soils transform into mercuric sulfide which is sostable that can be existed in the soil with a long time, because of chemicalstabilization repair techniques. Moreover, the mobility and toxicity of mercuryin soil is become low.Evaluation of stabilization of mercury in soils was conducted by in a partof experiment. It has been indicated that Triticum aestivum mainly absorbedthe water soluble and exchangeable fraction of Hg and bound to iron andmanganese oxides fraction Hg in soils. In addition, Triticum aestivum is ableto absorb little of bound to carbonates fraction of Hg, bound to organic matter fraction of Hg and residual fraction of Hg in soils. The results work as one ofthe efficient evaluation of stabilization of mercury in soils.In single factor experiments and orthogonal experiment of stabilization ofmercury in soils, the three factors are pH, amount of stabilizer and amount oforganic matters. According to the results of stability efficiency, bioavailabilityand leaching toxicity efficiency, the best condition of stabilization is S:Hg=7,4.62%(organic matters content), and pH6.