安培滴定法测定镎的研究  

DETERMINATION OF NEPTUNIUM BY AMPEROMETRIC TITRATION

作　　者：曹希寿[1] 许盛昌[1] 吴佩丽[1] 文真君 

机构地区：[1]中国原子能科学研究院

出　　处：《核化学与放射化学》1994年第1期43-48,共6页Journal of Nuclear and Radiochemistry

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%.

关 键 词：镎 测定 安培滴定法 

分 类 号：O614.352[理学—无机化学]