The Study On Environmental Behavior Of Ammonium Butyl Aerofloat In Soils

Toxicity flotation agents are widely used in mining aera, but mostly are not treated anddischarged with wasted water into environment, lead the entironment become worsen. Previousstudy about mine environmental problems were focusing on heavy metals and inorganic agentcyanide, neglected toxicity organic agent. Now, the study on organic agent are less, only payattention to the aspect of contamination characters and degradation in water environment,neglecting the environmental behaviour in soils. The article focus on the environmentalbehaviour of organic agent (ammonium butyl aerofloat) in soils, investigates the adsorption,degradation and transport characters by means of inspecting the influence of various factors onenvironmental behavior, order to offer basic consults for soil contamination remediation. Themain conclusions were as follows:1) The adsorption of ammonium butyl aerofloat on paddy soil and red soil were slight; Thecapacity of two soils were increasing with oscillation time extended,initial concentration roseand soils dosage grown, pH of7reached maximum; Adsorption process accorded withadsorption kinetics equation well in two soils, adsorption rate constant were1.29and2.68g·mg-1·min-1while equilibrium adsorption capacity (qe)were18.94and13.14mg·g-1respectively;Adsorption process also fitted F and L adsorption isotherms equation and showed a goodlinearity, the most adsorption capacity were29.2and22.8mg·g-1, lgKfwere2.408and1.721separately; For all, the adsorption ability to ammonium butyl aerofloat of paddy soil was greaterthan red soil, it was related to soil texture.2) Degradation rates of ammonium butyl aerofloat in two soils were all increased withextending of cultivating time and decreased with initial concentration rising; Maximumdegradation rates (upper than80%) in two soils were obtained under the conditions of60%moisture and25℃temperature; Degradation rates were decreased significantly by sterilizationand illumination, the microbial degradation of ammonium butyl aerofloat in paddy soil and redsoil were78%and63%, photo-degradation were19.5%and24%. So, the main degradationmechanism of ammonium butyl aerofloat in soils were microbial degradation. 3) Degradation process of ammonium butyl aerofloat in soils were all fitted degradationkinetics equation well. Degradation rate constants decreased with initial concentrations andhalf-life periods increase. In paddy soil, the rate constants were0.230,0.215,0.193d-1under theconcentrations of1,5,20mg/kg and their half-life were3.01,3.21,3.58d separately. In red soil,the rate constants were0.527,0.265,0.134d-1and their half-life were1.32,2.62,5.16d.Reference to《Chemical pesticide environmental safety evaluation test rule》, ammonium butylaerofloat was the more easily degradable organic matter.4) The amount of ammonium butyl aerofloat leached was different in different soil profile,it decreased with depth deppen; In the same soil, the amount of ammonium butyl aerofloatleached and migration distance increased with pH value and initial concentration increase; Themaximum amount of leached were all accumulated10cm approximately, and was taken up6.2%and5.7%of initial concentration of1mg/kg while29.2%and27.7%of5mg/kg in paddy soil andred soil respectively; The migration distance of ammonium butyl aerofloat in red soil was longer,but it was less than40cm, it was related to soil texture,the content of organic matter,soilpartical,the property of agent and the behavior of adsorption-desorption of ammonium butylaerofloat in soils.5) The adsorption of ammonium butyl aerofloat on soils were slight was one of the factorsresulting ammonium butyl aerofloat easily migrated. So, pay attention to ammonium butylaerofloat pollution of underwater and carry out safety evaluation which require immediatelysolution.