铀浓缩物中钾和钠的原子吸收法测定

ATOMIC ABSORPTION SPECTROMETRIC DETERMINATION OF POTASSIUM AND SODIUM IN URANIUM CONCENTRATE

本文采用硫酸(1:3)和过氧化氢加热分解试样,以PH2硫酸铀酰溶液通过201×7强碱性阴离子交换树脂吸附分离铀,钾和钠不被吸附,从而使钾和钠与铀分离。淋出液中的钾和钠用火焰原子吸收法测定。钾和钠在0.1—1.2μg/ml范围内有良好的线性关系;方法的相对标准偏差均优于±5％;回收率分别为93—105％和92—102％;本法适用于铀浓缩物中含量为0.025—0.3％钾和钠的测定。

The sulphuric acid (1:3) and hydrogen peroxide were used to heat and dissolve the samples, and the strong basic anionic ion-exchange resin 201×7 to adsorb and separate uranium from uranyl sulphate solution (pH=2), K and Na were not adsorbed, so K and Na were separated from uranium. And then the K and Na in stripped solution were determined by flame atomic absorption method. K and Na had good linear relation in the range of 0.1-1.2 ug/ml. The relative standard diviations of the method for both K and Na were better than +5%, the recoveries were 93-105% and 92-102% respectively. This method is suitable for determination of K and Na with content 0.025-0.3% in uranium concentrate.