摘要
0.500 0 g试样溶于硝酸及数滴盐酸中,加入硫酸(1+1)4 mL冒烟,冷却后用3.0 mol.L-1氢氧化钠溶液调节试液酸度至pH 2.0~2.5,将试液以0.5~1.0 mL.min-1流速通过阴离子交换树脂柱。试样中钍(Ⅳ)与铀(Ⅵ)与硫酸根形成络阴离子吸附在树脂上,用0.01 mol.L-1硫酸(20 mL)淋洗树脂,使钍及铀与钆等其他元素分离,弃去洗出液,改用6.0 mol.L-1盐酸作洗提液,流速上同。弃去最先流出的7 mL洗出液,收集之后流出的18 mL洗出液于一小烧杯中,其中含有试样中的钍,铀仍留在树脂上。将溶液蒸至近干,用1.0 mol.L-1硝酸溶解残渣并移入5 mL容量瓶中,用此硝酸溶液洗涤并定容。此溶液供电感耦合等离子体原子发射光谱法(ICP-AES)测定,对仪器的最佳工作条件及钍的分析条件作了较详细的分析。方法的测定下限为0.2μg.g-1,进行加标回收试验及精密度试验,相对标准偏差结果(n=6)为9.6%,平均回收率为105%。
0.500 0 g of the sample was dissolved in HNO3 with addition of several drops of HCl,and then fumed with 4 mL of H2SO4(1+1).After cooling,acidity of the solution was adjusted to pH 2.0-2.5 with 3.0 mol·L-1 NaOH solution.Thorium,together with the matrix uranium were adsorbed on the anion exchange resin column in the form of anionic complex with SO2-4 anion,and separated from Gd(Ⅲ) and other co-existing cation by elution with 0.01 mol·L-1 H2SO4(20 mL) at a flow-rate of 0.5-1.0 mL·min-1.The eluate was rejected....
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2007年第12期1053-1055,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
