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《Radiation Protection》 2016-01
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Speciation and solubility of americium in Beishan groundwater

Guo Hui;Kang Mingliang;Chen Wanliang;Long Junchen;Zhao Zhun;Sino - French Institute of Nuclear Engineering and Technology,Sun Yat - Sen University;CAS Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;  
Based on the thermodynamic datapublished by OECD / NEA and the estimated saturation indices for the precipitation of secondary minerals,the influence of p H,calcite,CO_2,and humic acid( HA) on the speciation distribution and solubility of Americium( Am) in Beishan groundwater were investigated using PHREEQC software. The results indicated that Am mainly occurred as Am CO~+_3and Am SiO( OH)~(2 +)_3at nearly neutral condition,whereas AmOHCO_3·0. 5H_2O( cr) and Am( OH)_3( cr)became predominantly at alkaline condition. Therefore,alkaline Beishan groundwater is favorable for the retardation of Am. Calcite exhibited a complex effect on the solubility and mobility of Am. At pH 6—8,it can decrease the solubility of Am slightly; at pH 8—9. 7,the formation of anionic Am( CO3)-2was favorable thus the solubility and mobility of Am increased in presence of calcite; whereas as p H increased to 9. 7—11,calcite can decrease the solubility of Am because of the formation of Am OHCO_3·0. 5H_2O( cr). When p H was fixed at 7. 56,the solubility of americium decreased firstly and then increased subsequently with increasing CO_2 pressure,and reached a minimum value at 10- 2. 25 bar. The results also indicated that humic acid had strong affinity towards americium,and from nearly acidic to alkaline conditions it could increase the solubility and hence the mobility of americium.
【Fund】: 国家自然科学基金(No.41403075);; 中山大学青年教师培育项目(No.45000-31610011)资助
【CateGory Index】: TL942.1
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