Organoarsines Drug Adsorption Behavior Of The Soil (sediment) In

o-arsenilic acid (2-aminophenylarsonic acid) belongs to phenylarsenicals, and it has been widely used as anti-parasitic and growth-promoting additives for intensive poultry and swine farming in world. They into soil with the manure application could be fastly leached into groundwater from different depth soils, being a risk to water environment and human health. Therefore, it is of great significance to analysis the adsorption of phenylarsenicals on soil and sediment, for studying the environmental behavior of phenylarsenicals in order to evaluate the environmental hazards and human risk.In this study, o-arsenilic acid was used as the model phenylarsenicals micropollutants, using HPLC and UV spectrophotometry analysis. Its behaviors of distribution on the kaolinite, red-soil and sediment were investigated. During the experiments, the effects of pH, temperature, ferric ion and other factors on the removal rate of o-arsenilic acid and Roxarsone were investigated respectively. The main conclusions are as follows:The kinetics results showed that the adsorption process of o-arsenilic on the kaolinite could be divided into quick stage and slow stage; adsorption equilibrium could be achieved within4hours; in quick stage, the adsorption rate of up to94.37%of the adsorption equilibrium adsorption rate. The results showed that its adsorption was well-described by the Freundlich equation, the adsorption isotherms resembling the L-type curve. Factors that affect the participation of o-arsenilic on the kaolinite include pH, temperature, heavy metal and others. Low adsorption rate appears under neutral pH conditions, and under the experimental conditions, the temperature of the system has little effect on the adsorption rate. How ferric ion affects the adsorption depends on the concentration of the ferric ion, the more amount ferric ion in system, the more the adsorbed amount and more infullence temperature has. Meanwhile, with the addition of ferric ion, the relationship between adsorbed amount pH changed.The kinetics results showed that the adsorption process of o-arsenilic on the red-soil could be divided into quick stage and slow stage; adsorption equilibrium could be achieved within8hours; in quick stage, the adsorption rate of up to74.29%of the adsorption equilibrium adsorption rate. The results showed that its adsorption was well-described by the Freundlich equation, the adsorption isotherms resembling the L-type curve. Factors that affect the participation of o-arsenilic on the red-soil include pH, temperature, heavy metal and others. Low adsorption rate appears under alkaline conditions, and under the experimental conditions, the temperature of the system has great effect on the adsorption rate. How ferric ion affects the adsorption depends on the concentration of the ferric ion, the more amount ferric ion in system, the more the adsorbed amount and more infullence temperature has. Meanwhile, with the addition of ferric ion, the relationship between adsorbed amount pH changed.The kinetics results showed that adsorption equilibrium could be achieved within10hours, before the adsorption equilibrium adsorption capacity has been slowly rising. The results showed that its adsorption was well-described by the Freundlich equation, the adsorption isotherms resembling the L-type curve. Factors that affect the participation of o-arsenilic on the sediment include pH, temperature, ferric ion, natural organic matters and others. Low adsorption rate appears under acidic conditions, and under the experimental conditions, the temperature of the system has little effect on the adsorption rate. How ferric ion affects the adsorption depends on the concentration of the ferric ion, the more amount ferric ion, the more the adsorbed amount and more infullence temperature has. Meanwhile, with the addition of ferric ion, the relationship between adsorbed amount pH changed. The organic matters in sediment play a decisice role on adsorption.