Study on the Distribution and Occurrence State of Arsenic in Mine Soil,Inner Mongolia

The colorimetric analysis of Ag-DDC was used to determine the content of As in soils from different positions,which were sampled from the mining area,Inner Mongolia.The distribution features of As in mine soil were analyzed and the chemical sequential extraction method was used to investigate the occurrence state of As.The results showed that the average content of total As in the soil samples is 8.35mg/kg,which is lower than the national level 2standard.But the content and distribution of arsenic in soil are closely related to the development of mining area.During high-As coal mining,it was found that the content of arsenic in soil around the mine was increased.The content of arsenic varied with the occurrence state of As.The results showed that As content varied from high to low in the order of residue-state arsenic(62.79%),calcium-type arsenic(15.74%),iron-type arsenic(12.47%),aluminum-type arsenic(7.17%),exchanged arsenic(1.56%)and dissolved arsenic(0.27%)and the content of non-available arsenic(62.79%)was higher than that of available arsenic(37.21%).