摘要
用分光光度法研究了硝酸体系中特丁基肼还原Np(Ⅵ )的动力学。考察了特丁基肼浓度、酸度、NO-3 浓度、UO2 + 2 浓度、Fe3 + 浓度以及温度等对反应速率的影响。求出了反应动力学方程 :-dc(Np(VI) ) /dt =kc(Np(Ⅵ) )c0 .9(TBH) /c0 .75(H+ )。 2 5℃时的速率常数 :k=5 .4 4 (mol/L) -0 .15·min-1。反应的表观活化能 :Ea=6 1.2kJ/mol。在所研究的浓度范围内 ,NO-3 ,UO2 + 2 ,Fe3 + 对反应速率影响较小 ;
Kinetic study of Np(Ⅵ) reduction by tert butyl hydrazine in nitric acid media is performed by spectrophotometry. The effects such as concentration of TBH,H +,NO 3 -,UO 2 2+ ,Fe 3+ and temperature are investigated. The results show that the reaction rate equation may be expressed as follows: d c (Np(Ⅵ))/d t = kc (Np(Ⅵ)) c 0.9 (TBH)/ c 0.75 (H +). The rate constant of the reaction at 25 ℃ equals to 5.44 (mol/L) -0.15 ·min -1 . The activation energy of the reaction equals to 61.2 kJ/mol.The influences of NO 3 -,UO 2 2+ ,Fe 3+ on the reaction rate are negligible in the concentration range studied. The reaction rate increases apparently with rising temperature.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2002年第3期134-137,共4页
Journal of Nuclear and Radiochemistry
