方波悬汞吸附伏安法测定八氧化三铀中的钛

Determination of Titanium in Triuranium Octaoxide by Square Wave Static Mercury Adsorption Voltammetry

U_3O_3用HNO_3溶解,用TBP萃淋树脂分离铀,水溶液用HClO_4蒸干,残渣溶于10ml、pH=6.1的0.1mol/L EDTA、lmol/L的NaAc溶液中,加入1％铜铁试剂0.5ml,于-0.6V～-1.1V的电位范围内用方波伏安法测定钛。标准偏差约为5％,最低检出限为0.5ng/ml。

The U3O8 sample is dissolved in nitric acid and uranium is removed by TBP levetrel resin. The aqueous solution is evaporated to dryness with perchloric acid. The residue is dissolved in 10 ml of 0. 1 mol/L EDTA-1 mol/L NaAc at pH 6. 1±0. 1.Then 0. 5 ml of 1% cupferron is added. The titanium is determined by square wave voltammetry between -0. 60--1. 10 V(vs. Ag/AgCl). This method is accurate and precise. The detection limit is 0. 5 ng Ti/ml.