HBTMPDTP对~(244)Cm萃取行为的研究

STUDY ON EXTRACTION OF ~(244) Cm BY HBTMPDTP

摘要: 研究了二(2,4,4 三甲基戊基)二硫代膦酸(HBTMPDTP)从NaNO3 HNO3介质中萃取示踪量244Cm的行为。考察了搅拌时间、离子强度、平衡水相pH值、萃取剂浓度和温度等因素对萃取平衡的影响,给出了萃取反应方程式。计算得到萃取平衡常数Kex=10-7.84±0.09,萃取反应焓ΔH0=17.4kJ/mol,熵ΔS0=-95.2(J·mol)/K。

Abstract: The extraction of trace amount of 24 4 Cm by HBTMPDTP from NaNO 3-HNO 3 solution is studied. The distribution ratios of 244 Cm vary with stirring time, ion intensity, pH value of equilibrated aqueous phase, concentration of HBTMPDTP and temperature. The equation of extraction is obtained and the following parameters are calculated: equilibrium constant K ex =10 -7.84±0.09 ,extraction enthalpy Δ H 0=17.4 kJ/mol and extraction entropy Δ S 0=-95.2 (J·mol)/K.