【作者】 赵欣； 章英杰； 魏连生； 林漳基；

【Author】 ZHAO Xin ZHANG Ying-jie WEI Lian-sheng LIN Zhang-ji (China Institute of Atomic Energy,Beijing 102413)

【机构】 中国原子能科学研究院；

【摘要】 本文采用FT-Rama光谱技术初步研究了不同条件下Np（Ⅴ）在溶液中的存在形态;采用离心法研究了Np（Ⅴ）的胶体行为,研究了不同离子强度（0.01mol/L、0.1 mol/L、1.0 mol/L）、不同放置时间（6h、30h、1week、6weeks）、不同pH值（2～12）以及不同Np（Ⅴ）浓度对Np（Ⅴ）胶体形成的影响;采用批式法研究了Np（Ⅴ）在花岗岩及其造岩矿物（钾长石、钠长石、黑云母、石英、角闪石）中的吸附行为。实验结果表明,Np（Ⅴ）的Raman光谱随着溶液的pH值、离子强度及放置时间的不同而发生不同的变化;当溶液的pH值>6后,Np（Ⅴ）溶液中产生的可离心部分主要是器壁吸附或形成的真胶体NpO₂OH所致;Np（Ⅴ）胶体的形成与其水解程度、溶液的离子强度及放置时间等有关;Np（Ⅴ）胶体的形成有利于其在花岗岩及其造岩矿物中的吸附。更多还原

【Abstract】 The speciation of Np(Ⅴ) in solutions is measured by means of FT-Raman Spectrometer.The formation of colloid of Np(Ⅴ) in aqueous solutions is studied with the variation of pH(2～12),ionic strength (0.01 mol/L,0.1 mol/L,1.0 mol/L),storage time(6h,30h,1week,6weeks) and neptunium concentration.The adsorption behavior of Np(Ⅴ) on granite and its rock-forming minerals(quartz,microcline,albite,biotite and hornblende) is also studied in an aqueous phase of artificial ground water.The experiments are performed at ambient temperature. Experimental results show that a small fraction of Np removed from the solution is adsorbed on the walls of container at the pH above 6 due to the formation of colloid of Np.The formation of colloid of Np depends on its hydrolytic extent,ionic strength,and storage time.The adsorption of Np on granite and the individual mineral depends strongly on the formation of the colloids with the variation of pH in solutions.更多还原