PMBP萃取α能谱法测定大量钚中微量镅  

Determination of Trace Americium in the Presence of Large Amount of Plutonium by Extraction α Spectrometry

作　　者：黄小红[1] 陈永清[1] 刘协春[1] 李瑞雪[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2010年第2期84-88,共5页Journal of Nuclear and Radiochemistry

摘　　要：研究了1-苯基-3-甲基-4-苯甲酰基吡唑酮-5(PMBP)萃取HNO3溶液中镅、钚的性能,研究了水相酸度、相比(有机相∶水相)、萃取次数、萃取剂浓度等对PMBP萃取性能的影响。实验结果表明,在酸度为2 mol/L、相比为1∶1时,0.1 mol/L PMBP-二甲苯对分析样品进行一次萃取一次洗涤即能有效的分离大量钚,满足α能谱对微量镅的测定。该方法钚与镅的分离系数约为106,在C(Pu)/C(Am)≥106时对Am的相对偏差不大于8%。The effect of the acidity in aqueous phase, phase-ratio, times of extraction and concentration of extractant on the extraction of Pu（ Ⅳ ） and Am（ Ⅲ ） from nitric acid solution by 1-phenyl-3-methyl-4-benzoylpyrazolone-5（PMBP） in organic solution were studied. The results show that the optimum conditions of Pu and Am separation are summed up as 2 mol/L of nitric acid solution, 1 ： 1 of phase-proportion, 0.1 mol/L PMBP-dimethyl- benzene, a single extraction and a single washing. The separation factor between Pu and Am （SF（Pu/Am）） is about 106. The relative deviation for determination of Am is no more than 8% when C（Pu）/C（Am） is no less than 106.

关 键 词：PMBP AM PU 分离系数 

分 类 号：O615.11[理学—无机化学]