摘要：
The farmland soil and creek sediments in different depth in the mining area were sampled, and their content of 238U,226Ra and 232Th were determined by gamma spectrometric method to assess the impact of the soil environment by single index method. The result shows 232Th was not influenced on soil in survey area. 226Ra influenced more seriously than 238U on farmland soil, meanwhile, the farmland soil at downstream of tailings dam was contaminated seriously by radionuclides than at other places. For creak sediments ,adit water resulted in more serious pollution by 238U than 226Ra, however, tailings erosion resulted in more serious pollution by 226Ra than 238U.
作者机构：
[Qinwen Deng; Junwen Lv; Jinsong Wang] University of South China, Hengyang, Hunan, CN
通讯机构：
School of Environmental Protection and Safety Engineering, University of South China, China
会议名称：
2011 International Conference on Electrical and Control Engineering
会议时间：
September 2011
会议地点：
Yichang, China
会议论文集名称：
2011 International Conference on Electrical and Control Engineering
关键词：
magneticmicrosphere;adsorption;cadmium ion
摘要：
Recently, the technique of magnetic separation has been used to dispose water, especially the waste water of low concentration. The technique of magnetic separation is that we segregate different materials with the power of magnetic field. In this study, using chitosan — as raw materials, magnetic materials as the Cole, organically-linking technique was applied to produce magnetic microspheres. The study is mainly on the absorbent for Cr (VI) adsorption. The effect factors such as PH, the reaction time, the initial concentration and dosage temperature. The result is magnetic microspheres have enough adsorption properties for Cr (VI), and its maximum uptake capacity was 48.3245mg/g. The optimum reaction conditions were: pH is 5, the reaction time 4 hours, dosage 1.0g, initial concentration of Cr (VI) 10mg/L. The adsorption isotherms of these two adsorbents for Cr (VI) fitted Langmuir's and Freundlich's models. Freundlich's equation of imprinting chitosan: y=0.8217×−2.1036, R2=0.9863. The reaction kinetic of the adsorbent was in accordance with linear regression equation is y=0.2853×+0.5621.
