仲钨酸A与仲钨酸B的化学活性及其转变速度的研究

The Chemical Activities of Paratungstate A and B and the Study for Their Rate of Transformation

根据ParaA和ParaB对H_(2)O_(2)反应活性的差异,提出己酸化的钨酸钠溶液经加热陈化后溶液中ParaB的测定方法(即H_(2)O_(2)-SO_(2)法)。求出不同Z(H+/W)值溶液在80℃时ParaB的形成速度,发现形成速度呈线性变化,且随Z值的增加而变慢。从ParaA和ParaB的结构解释了它们对H_(2)O_(2)活性上的差异。

Taking advantage of their difference,the quantity of the non-active component,para B,in the acidified timgstate solution aged by heating can be determined.Making use of the method of H_(2)O_(2)-SO_(2),the rate of formation of para Bare determined at 80℃ with Zvalues(H^(+)/W)equal to 0.667,0.850,1.00 and 1.14 respectively.It is found that expect the solution with Z=1.14 in which the disproportionation reaction may occured,in all the solutions with other Zvalues the formations of,para Eare very slow.The characters of the changing of the rates of para Bformation are linear,and the formation rate decreases as the Zvalue increases.The activity difference with H_(2)O_(2) between para A and B is explained according to their structure.