Abstract：In order to study the mechanism of the removal of arsenic in groundwater,the adsorption experiment and soil column simulation experiment were adopted to study the different influenceing factors about the removal of arsenic in groundwater,such as different adsorption media,initial concentration,and the valence state of arsenic removal. The result of the adsorption experiment showed that the average adsorption rate about As( V)on the iron ore was 35% and on goethite reaches was 14% in the initial concentration of a 0. 05mmol /L condition. The average adsorption rate about As( V) on the iron ore was 87% and on goethite was 37% in the initial concentration of a 0. 01mmol /L condition. The average adsorption rate about As( Ⅲ) on the iron ore was73% and on goethite was 39% in the initial concentration of a 0. 01 mmol /L condition. The result of the soil column simulation experiment showed that the average adsorption rate about As( V) on the fine sand was72%,then the average adsorption rate was 93% after adding the ferric hydroxide to the fine sand. The average adsorption rate about As( V) on coarse sand was 80%,then the average adsorption rate was 93% after adding the ferric hydroxide to the coarse sand. The average adsorption rate about As( Ⅲ) on the fine sand and coarse sand was 99. 9%. Results indicated that the ferric hydroxide which produced by adding the Fe3 +and OH-to the sad could in favor of the adsorption of As,coarse sand and fine sand had strong adsorption of As( Ⅲ).

Keyword：groundwater;arsenic;adsorption experiments;simulated experiment of soil column;