Study On Migration Behavior Of Fulvic Acid And Heavy Metals In Porous Media

There are a large of fulvic acid?FA?in the soil,which can form complexation with heavy metal through physical and chemical properties bacause of its many functional groups.It can affect the migration process of the FA and heavy metals in the underground environment under the change of physical and chemical condition,which cause underground pollution and pose a potential threat to human health.Therefore,peat soil sample was collected from Zhangwu County Liaoning Province and FA was extracted the sample using the method from International Humus Association?IHSS?.The FA was characterized jointly with FTIR,NMR and element,through intermittent experiments to study different velocities?0.5ml/min,1.5 mL/min,2 mL/min,3 mL/min?,different pH?5,6,7,8?,different ionic intensities?0.01 mg/L,0.1 mg/L,0.5 mg/L,1.0 mg/L?and different Tween-80 concentrations?0.1 g/L,0.3 g/L,0.5 g/L,0.7 g/L?,the migration of the FA in the conditions,The results showed that the migration effect of FA decreases with the increase of Ca²⁺ concentration.As the concentration of Tween-80 decreases,and the flow velocity had little effect on the migration of rich acid in porous media,when pH is neutral,the effect of FA in porous media was best.Through the migration behavior experimental of FA and multi-component heavy metals(Zn²⁺,Pb²⁺,Cd2+)in porous media,to study the migration effects of the FA with the single heavy metals(Zn²⁺?Pb²⁺?Cd2+)?two-component heavy metals(Zn²⁺+Pb²⁺?Cd2++Zn²⁺?Cd2++Pb²⁺)and three-component heavy metals(Zn²⁺+Pb²⁺+Cd2+).And through the change of pH?5,6,7?and ionic strength?0.01 mg/L,0.1 mg/L,1 mg/L?,to study the penetrating capacity of FA and two-component heavy metals.The results showed that when the FA and two-component heavy metals(Pb²⁺+Zn²⁺?Cd2++Pb²⁺)migrated in porous media can inhibited the migration behavior of Pb²⁺,and promoted the migration of Zn²⁺ and Cd2+.When the Zn²⁺ and Pb²⁺ migrated in porous media would simultaneously inhibiTed the migration behavior of Zn²⁺ and Cd2+ in porous media.With the decrease of pH and Ca2+ concentration,the C/C0 and MR values of FA showed a trend of increasing.When the FA and three-component heavy metals(Zn²⁺+Pb²⁺+Cd2+)migrated in porous media,the presence of FA had hindered effect to the heavy metals.