萃淋树脂分离-催化极谱法测定核级UO_2及U_3O_8中的钛

CATALYTIC POLAROGRAPHIC DETERMINATION OF TITANIUM IN NUCLEAR-GRADE UO_2 and U_3O_8 SEPARATED BY LEVEXTREL RESIN

样品溶液经ＣＬ－５２０９＃淋树脂在２ｍｏｌ／Ｌ硝酸介质中分离铀后，用催化极谱法测钛。在含乙酸一乙酸铰缓冲液（ｐＨ５．５）的０．４％ＥＤＴＡ－０．００２％铜铁试剂一０．００５ｍｏｌ／Ｌ溴酸钠底液中，于一０．６５Ｖ（ｖｓ．ＳＣＥ）有一钛催化波，进行二次导数测定。钛峰高与浓度在０．００５－０．０５μｇ／ｍＬ有线性关系。称样０．１ｇ钛的测定下限为０．５μｇ／ｇ。相对标准偏差优于６％，加入回收率为９４％一１０６％。

The titanium was separated in the 2mol/L nitric acid from uranium by the levextrel resin CL-5209 and then determined by catalytic polarography.In the supporting electrolyte of 0.4% EDTA-0.002% cupferron-0.005mol/L NaBrO3 containing HAc-NH4Ac buffer solution (pH5. 5),the derivative peak potential of Ti was - 0. 65V (vs.SCE).The polarographic peak height maintained a linear relation with the Ti concentration over 0. 005-0. 05μg/mL.The lower detective limit was 0. 5μg/g(U).The relative standard deviation was better than 6 %.