The reduction kinetics of pertechnetate by thiocyanate in perchloric acid is studied by spectrophotometric method. The effect of the concentrations of pertechnetate, hydrogen ion and thiocyanate on the reaction rate is investigated. The kinetic expression at 25 ~ is: dCvii/dt = (2.2_+0.4). 10 3 [TcO 4 ]1.1 [H+]3.2 [SCN ]3.3. The effect of temperature on the reaction rate is studied. The activation energy is 91 kJ/mol. The possible mechanism of the reaction is discussed.
TI chemical state / 213 Bi a-decay effect /Bismuth diethyldithiocarbamate
AbstractThe chemical state of 10 »T1 produced by α-decay of 212 Bi in a diethyldithiocarbamate chelate, Bi(DDC)3, has been investigated. Almost no inorganic 20 'T1 3+ was observed either at room temperature or at liquid nitrogen temperature. The chelate parent compounds 2-mercapto-4-phenyl-l,3,4-thiadiazoline-5-thione, bismuthol(II) (C6HSNCS2NCSH) and 8-hydroxy-quinoline, oxine of 212 Bi were also studied and compared with the Bi(DDC)3 system. The probable cause of the deficiency of thallic ion is considered to be the chemical environment in which 212 Bi undergoes radioactive decay.
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