摘要
在0.5mol/l的酸性溶液中,用AgO将镎氧化到Np(Ⅵ),过量AgO用氨基磺酸破坏,在3mol/l酸度下,用Fe(Ⅱ)滴定Np(Ⅵ)至Np(Ⅳ),过量Fe(Ⅱ)用标准重铬酸钾回滴,用安培法指示其终点。测定2mg镎时,精密度优于0.3%。与恒流库仑法进行样品核对,两种方法之间的相对偏差为0.22%,测定结果吻合。还作了在铀共存下镎的精密测定。
Neptunium is oxidized to Np(Ⅵ)in 0.5mol/l acid medium by AgO. Excess AgO is de-stroyed by aminesulfonic acid.Then Np(Ⅵ)is titratcd to Np(Ⅳ)in 3mol/l acid medium byFe(Ⅱ).Excess Fe(Ⅱ)is re-titrated by standard potassium dichromate solution. In order toobtain precise and accurate results for such a small sample, weight burets are frequently usedtaking aliquots and the titrants.A platinum indication electrod and a calomel reference elec-trod are used to measure the cell amperage. The relative standard deviation for the determi-nation of 2mg neptunium is less than 0.3%.The relative deviation of the present methodcompared with the constant current coulometry is less than 0.22%.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1994年第1期43-48,共6页
Journal of Nuclear and Radiochemistry
关键词
镎
测定
安培滴定法
Neptunium Accurate determination Amperometric titration